Stock-Based Compensation - Option Activity Tables (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Jan. 13, 2017	Oct. 04, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock Options
Number of shares
Outstanding at beginning of period			2,661,282	3,574,439	3,568,434
Granted			367,142	387,306	543,881
Forfeitures			(71,534)	(114,769)	(154,510)
Exercises			(265,831)	(1,185,694)	(383,366)
Outstanding at end of period			2,691,059	2,661,282	3,574,439
Weighted Average Exercise Price
Outstanding at beginning of period			$ 15.94	$ 10.78	$ 7.82
Granted			63.27	43.82	31.12
Forfeited			31.61	30.64	16.22
Exercised			8.94	8.08	9.91
Outstanding at end of period			$ 22.67	$ 15.94	$ 10.78
Outstanding, Weighted Average Remaining Contractual Term			5 years 8 months 12 days
Outstanding, Intrinsic Value			$ 72,621
Exercisable, Number			1,852,025
Exercisable, Weighted Average Exercise Price			$ 10.92
Exercisable, Weighted Average Remaining Contractual Term			4 years 4 months 24 days
Exercisable, Intrinsic Value			$ 66,165
Expected to Vest, Outstanding, Number			761,428
Expected to Vest, Outstanding, Weighted Average Exercise Price			$ 48.62
Expected To Vest, Weighted Average Remaining Contractual Term			8 years 6 months
Expected To Vest, Aggregate Intrinsic Value			$ 5,858
Performance Stock Options
Number of shares
Outstanding at beginning of period			135,000	150,000	200,000
Granted			0	0	0
Forfeitures			0	0	0
Exercises			(105,000)	(15,000)	(50,000)
Outstanding at end of period			30,000	135,000	150,000
Weighted Average Exercise Price
Outstanding at beginning of period			$ 20.64	$ 20.41	$ 19.89
Granted			0	0	0
Forfeited			0	0	0
Exercised			20.41	18.33	18.33
Outstanding at end of period			$ 21.45	$ 20.64	$ 20.41
Outstanding, Weighted Average Remaining Contractual Term			7 years
Outstanding, Intrinsic Value			$ 746
Exercisable, Number			30,000
Exercisable, Weighted Average Exercise Price			$ 21.45
Exercisable, Weighted Average Remaining Contractual Term			7 years
Exercisable, Intrinsic Value			$ 746
Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 21.45	$ 18.33
Options vested	100,000	100,000