Common Stock and Share-Based Compensation - Share Repurchase Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of shares repurchased	1,371	3,166
Weighted average purchase price per share (in dollars per share)	$ 18.21	$ 16.73
Amount of share repurchases	$ 25,000	$ 53,010	$ 25,000