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Summary of Significant Accounting Policies Adjustments to Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax provision | $ 9,200 | $ 989 | $ 5,188 | $ 9,350 |  |  |  |  | $ 19,450 | $ 43,555 | $ 35,527
Net income | $ 31,196 | $ 35,430 | $ 25,007 | $ 18,224 | $ 8,618 | $ 20,142 | $ 18,836 | $ 17,273 | $ 109,857 | $ 64,869 | $ 58,940
Basic (USD per share) |  | $ 0.97 | $ 0.69 | $ 0.50 |  |  |  |  | $ 3.01 | $ 1.90 | $ 1.79
Diluted (USD per share) | $ 0.80 | $ 0.91 | $ 0.65 | $ 0.47 | $ 0.23 | $ 0.55 | $ 0.52 | $ 0.48 | $ 2.82 | $ 1.77 | $ 1.66
Diluted weighted average shares outstanding (in shares) | 38,975 | 39,062 | 38,738 | 39,071 | 37,864 | 36,349 | 36,097 | 35,895 | 38,961 | 36,552 | 35,401
Net cash provided by operating activities |  | $ 79,213 | $ 19,520 | $ 41,321 |  |  |  |  | $ 191,859 | $ 134,327 | $ 142,839
Net cash (used) provided by financing activities |  | (90,095) | 25 | (16,911) |  |  |  |  | $ (138,075) | $ 91,052 | $ (3,993)
Scenario, Previously Reported |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax provision |  | 14,155 | 11,323 | 10,495 |  |  |  |  |  |  |
Net income |  | $ 22,264 | $ 18,872 | $ 17,079 |  |  |  |  |  |  |
Basic (USD per share) |  | $ 0.61 | $ 0.52 | $ 0.47 |  |  |  |  |  |  |
Diluted (USD per share) |  | $ 0.58 | $ 0.49 | $ 0.44 |  |  |  |  |  |  |
Diluted weighted average shares outstanding (in shares) |  | 38,506 | 38,196 | 38,557 |  |  |  |  |  |  |
Net cash provided by operating activities |  | $ 67,091 | $ 13,877 | $ 40,270 |  |  |  |  |  |  |
Net cash (used) provided by financing activities |  | $ (77,973) | $ 5,668 | $ (15,860) |  |  |  |  |  |  |

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