Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Quarterly Financial Information Disclosure [Abstract] | |||||||||||
Corporate tax rate change impact on deferred income taxes | $ 14,039 | $ 0 | $ 0 | ||||||||
Selected Quarterly Financial Information [Abstract] | |||||||||||
Revenue | $ 509,076 | $ 494,406 | $ 489,803 | $ 495,169 | $ 487,858 | $ 472,636 | $ 473,729 | $ 468,002 | 1,988,454 | 1,902,225 | 1,463,065 |
Gross profit | 162,092 | 159,539 | 161,012 | 161,776 | 158,606 | 154,467 | 154,753 | 151,898 | 644,419 | 619,724 | 469,363 |
Net income | $ 41,167 | $ 28,128 | $ 31,255 | $ 32,008 | $ 26,351 | $ 27,296 | $ 26,322 | $ 25,869 | $ 132,558 | $ 105,838 | $ 81,891 |
Basic (in dollars per share) | $ 0.86 | $ 0.59 | $ 0.65 | $ 0.67 | $ 0.55 | $ 0.57 | $ 0.55 | $ 0.54 | $ 2.77 | $ 2.21 | $ 1.72 |
Diluted (in dollars per share) | $ 0.84 | $ 0.57 | $ 0.63 | $ 0.65 | $ 0.54 | $ 0.55 | $ 0.53 | $ 0.53 | $ 2.68 | $ 2.15 | $ 1.68 |
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 Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- References No definition available.
|
X | ||||||||||
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- References No definition available.
|