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Operations and Summary of Significant Accounting Policies - Revisions and Out of Period Adjustments (Details) - USD ($) $ 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
Out-of-period adjustments
Gross profit	$ 102,698	$ 119,885	$ 123,525	$ 100,156	$ 94,966	$ 113,475	$ 111,487	$ 92,523	$ 446,264	$ 412,450	$ 358,919
Income from operations	$ 24,705	$ 46,696	$ 45,137	$ 22,629	$ 26,136	$ 45,777	$ 40,924	$ 26,641	139,167	139,477	109,021
Net income									$ 92,617	$ 89,734	$ 67,888

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