Stock-Based Compensation - Stock Option Rollforward (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Shares
Expired (in shares)	0	0	0
Employee Stock Option
Number of Shares
Outstanding at the beginning of the period (in shares)	0	7,101	7,101
Granted (in shares)	0	0	0
Exercised (in shares)	0	(7,101)	0
Outstanding at the end of the period (in shares)	0	0	7,101
Options exercisable at the end of the period (in shares)	0
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 5.75	$ 5.75	$ 5.75
Exercised (in dollars per share)		5.75
Outstanding at the end of the period (in dollars per share)	0.00	$ 5.75	$ 5.75
Options exercisable at the end of the period (in dollars per share)	$ 0
Weighted Average Remaining Contractual Term
Vested (in years)	0 years
Exercisable (in years)	0 years
Aggregate Intrinsic Value
Vested	$ 0
Exercisable	$ 0