Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
|
| Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] | ||||
| Net income | $ 117,760 | $ 103,324 | $ 201,060 | $ 158,295 |
| Other comprehensive income, net of tax: | ||||
| Change in value of derivatives | 20 | 21 | 41 | 42 |
| Other comprehensive income | 20 | 21 | 41 | 42 |
| Comprehensive income | $ 117,780 | $ 103,345 | $ 201,101 | $ 158,337 |