Stock-Based Compensation Plans - Weighted Average Fair Value of Options Granted (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	975	779	227
Grant date fair value (USD per share)	$ 3.39	$ 3.57	$ 5.58
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (USD per share)	8.20	8.72	15.05
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (USD per share)	$ 6.21	$ 7.18	$ 10.76