Stockholders' Equity - Stock Options Outstanding Rollforward (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Options
Outstanding at December 31, 2014 (in shares)	1,177
Granted (in shares)	75
Exercised (in shares)	(269)
Expired, canceled or forfeited (in shares)	(297)
Outstanding at December 31, 2015 (in shares)	686	1,177
Exercisable at December 31, 2015 (in shares)	379
Weighted Average Exercise Price
Outstanding at December 31, 2014 (in dollars per share)	$ 11.60
Granted (in dollars per share)	8.90
Exercised (in dollars per share)	9.06
Expired, canceled or forfeited (in dollars per share)	13.68
Outstanding at December 31, 2015 (in dollars per share)	11.41	$ 11.60
Exercisable at December 31, 2015 (in dollars per share)	11.39
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 11.42
Stock options, Outstanding, Weighted Average Remaining Contractual Life	2 years 2 months 23 days
Stock options, Exercisable, Weighted Average Remaining Contractual Life	1 year 6 months
Stock options, Outstanding, Aggregate Intrinsic Value	$ 681
Stock options, Exercisable, Aggregate Intrinsic Value	$ 382
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	674
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	2 years 14 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 662
Stock options
Number of Options
Exercisable at December 31, 2015 (in shares)		687	490
Weighted Average Exercise Price
Exercisable at December 31, 2015 (in dollars per share)		$ 11.60	$ 11.87
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock options, Outstanding, Weighted Average Remaining Contractual Life		2 years 14 days	2 years 8 months 19 days
Stock options, Exercisable, Weighted Average Remaining Contractual Life		2 years	1 year 9 months 3 days
Stock options, Outstanding, Aggregate Intrinsic Value		$ 123	$ 1,814
Stock options, Exercisable, Aggregate Intrinsic Value		$ 122	$ 761