Stock-Based Compensation (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) plan $ / shares shares	Sep. 30, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $	$ 300,000	$ 1,100,000	$ 1,700,000	$ 4,100,000
Number of share-based compensation plans | plan			4
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $			$ 0
Number of awards granted (in shares)			2,700,000
Number of awards outstanding (in shares)	4,700,000		4,700,000
Stock Appreciation Rights (SARs) | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards vested			50.00%
Number of average consecutive trading days required at trigger stock price			30 days
Minimum stock price required to trigger award vesting (in dollars per share) | $ / shares			$ 8
Stock Appreciation Rights (SARs) | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards vested			50.00%
Number of average consecutive trading days required at trigger stock price			30 days
Minimum stock price required to trigger award vesting (in dollars per share) | $ / shares			$ 12
Stock Incentive Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	2,063,929		2,063,929