Equity Compensation and Employee Benefit Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Stock Option Activity, Additional Disclosures
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Incentive Plan
Stock Option Activity Under the Incentive Plan
Outstanding at December 31, 2015	15,610
Granted (in shares)	0
Exercised (in shares)	(2,709)
Cancelled/forfeited (in shares)	10,729
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	(2,172)
Outstanding at December 31, 2016	0
Stock Options Weighted Average Exercise Price
Options outstanding, weighted average exercise price per share - December 31, 2015 (in usd per share)	$ 5.40
Options granted, weighted average exercise price per share (in usd per share)	0
Options exercised, weighted average exercise price per share (in usd per share)	7.51
Options cancelled/forfeited, weighted average exercise price per share (in usd per share)	4.83
Options expired, weighted average exercise price per share (in usd per share)	5.61
Options outstanding, weighted average exercise price per share - December 31, 2016 (in usd per share)	$ 0
Stock Option Activity, Additional Disclosures
Options exercisable, number of options (in shares)	0
Option exercisable, weighted average exercise price per share (in usd per share)	$ 0
Options exercised, aggregate intrinsic value	$ 25
Options outstanding, aggregate intrinsic value	0
Options exercisable, aggregate intrinsic value	$ 0