Stockholders' Equity - Stock Repurchase Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Feb. 29, 2016
Equity, Class of Treasury Stock [Line Items]
Remaining authorized repurchase amount			$ 16,300,000
2016 Stock Incentive Plan
Equity, Class of Treasury Stock [Line Items]
Outstanding common stock repurchase program authorized amount				$ 50,000,000.0
Purchase of common stock shares (in shares)	1,800,000.0
Total cost	$ 33,700,000
Average cost of repurchase (in dollars per share)	$ 18.90
Remaining authorized repurchase amount		$ 16,300,000