UNAUDITED QUARTERLY DATA (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| UNAUDITED QUARTERLY DATA | |||||||||||
| Revenues | $ 385,614 | $ 423,994 | $ 411,133 | $ 352,736 | $ 362,500 | $ 399,746 | $ 392,150 | $ 330,909 | $ 1,573,477 | $ 1,485,305 | $ 1,411,566 |
| Gross profit (Revenues less cost of services provided) | 192,619 | 218,386 | 215,190 | 174,934 | 180,265 | 204,257 | 201,941 | 162,866 | |||
| Net Income | $ 38,007 | $ 49,651 | $ 47,783 | $ 31,928 | $ 31,749 | $ 45,046 | $ 45,073 | $ 30,281 | $ 167,369 | $ 152,149 | $ 137,664 |
| Income per share: | |||||||||||
| Income per share Basic (in dollars per share) | $ 0.17 | $ 0.23 | $ 0.22 | $ 0.15 | $ 0.15 | $ 0.21 | $ 0.21 | $ 0.14 | $ 0.77 | $ 0.7 | $ 0.63 |
| Income per share Diluted (in dollars per share) | $ 0.17 | $ 0.23 | $ 0.22 | $ 0.15 | $ 0.15 | $ 0.21 | $ 0.21 | $ 0.14 | $ 0.77 | $ 0.7 | $ 0.63 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|