Equity-Based Compensation - Non-Management Director Equity-Based Compensation Additional Information (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted	581,672	3,239,948	183,190
Weighted Average Fair Value, Granted (in dollars per share)	$ 15.48	$ 17.22	$ 13.35
Number of Shares, Vested	785,820	299,703	202,689
Deferred stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted in period (in shares)	22,500
Deferred stock units | Tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award vesting period (in years)	2 years
Number of Shares, Vested	15,000
Non Management Directors Director Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Fair Value, Granted (in dollars per share)		$ 17.63
Non Management Directors Director Plan | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted		37,500
Share-based payment award vesting period (in years)	6 months
Non Management Directors Director Plan | Deferred stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted		22,500
Stock issued for service during period (in shares)	4,469	18,790
Prior Director Plan | Deferred stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted in period (in shares)	7,500
Prior Director Plan | Deferred stock units | Tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award vesting period (in years)	1 year
Number of Shares, Vested	7,500
Non Management Directors Director Plan, retainer fee, period one | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted	18,200
Weighted Average Fair Value, Granted (in dollars per share)	$ 16.10
Non Management Directors Director Plan, retainer fee, period two | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted	50,416
Weighted Average Fair Value, Granted (in dollars per share)	$ 13.17
Non Management Directors Director Plan, triennial service awards | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted	90,000
Non Management Directors Director Plan, triennial service awards | Restricted stock | Tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted	30,000
Non Management Directors Director Plan, triennial service awards | Restricted stock | Tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted	60,000
Non Management Directors Director Plan, triennial service awards | Deferred stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted	90,000
Weighted Average Fair Value, Granted (in dollars per share)	$ 13.17
Non Management Directors Director Plan, triennial service awards | Deferred stock units | Tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted	30,000
Non Management Directors Director Plan, triennial service awards | Deferred stock units | Tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted	60,000