Share-Based and Long-Term Compensation Plans - Summary of Share Unit Activity (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Restricted Stock
Number of Shares Activity [Roll Forward]
Balance at beginning of period (in shares)	13,769
Granted (in shares)	0
Vested/Exercised (in shares)	(8,343)
Forfeited (in shares)	0
Balance at end of period (in shares)	5,426
Weighted Average Grant-Date Fair Value [Roll Forward]
Balance at beginning of period (in dollars per share)	$ 14.61
Granted (in dollars per share)	$ 0.00
Vested/Exercised (in dollars per share)	$ 15.13
Forfeited (in dollars per share)	$ 0.00
Balance at end of period (in dollars per share)	$ 13.82
Deferred Incentive Share Units
Number of Shares Activity [Roll Forward]
Balance at beginning of period (in shares)	6,855
Granted (in shares)	0
Vested/Exercised (in shares)	0
Forfeited (in shares)	(285)
Balance at end of period (in shares)	6,570
Weighted Average Grant-Date Fair Value [Roll Forward]
Balance at beginning of period (in dollars per share)	$ 16.63
Granted (in dollars per share)	$ 0.00
Vested/Exercised (in dollars per share)	$ 0.00
Forfeited (in dollars per share)	$ 17.56
Balance at end of period (in dollars per share)	$ 16.59
Stock Options
Number of Shares Activity for Stock Options [Roll Forward]
Balance at beginning of period (in shares)	1,293,750
Granted (in shares)	0
Vested/Exercises (in shares)	(431,250)
Forfeited (in shares)	0
Balance at end of period (in shares)	862,500
Weighted Average Grante-Date Fair Value for Stock Options [Roll Forward]
Balance at beginning of period (in dollars per share)	$ 4.17
Granted (in dollars per share)	$ 0.00
Vested/Exercised (in dollars per share)	$ 4.18
Forfeited (in dollars per share)	$ 0.00
Balance at end of period (in dollars per share)	$ 4.18
Restricted Stock Units (RSUs)
Number of Shares Activity [Roll Forward]
Balance at beginning of period (in shares)	504,533
Granted (in shares)	267,596
Vested/Exercised (in shares)	(55,419)
Forfeited (in shares)	0
Balance at end of period (in shares)	716,710
Weighted Average Grant-Date Fair Value [Roll Forward]
Balance at beginning of period (in dollars per share)	$ 16.03
Granted (in dollars per share)	$ 13.50
Vested/Exercised (in dollars per share)	$ 18.74
Forfeited (in dollars per share)	$ 0.00
Balance at end of period (in dollars per share)	$ 14.88
Profits Interest Units
Number of Shares Activity [Roll Forward]
Balance at beginning of period (in shares)	300,636
Granted (in shares)	147,302
Vested/Exercised (in shares)	0
Forfeited (in shares)	0
Balance at end of period (in shares)	447,938
Weighted Average Grant-Date Fair Value [Roll Forward]
Balance at beginning of period (in dollars per share)	$ 9.26
Granted (in dollars per share)	$ 7.18
Vested/Exercised (in dollars per share)	$ 0.00
Forfeited (in dollars per share)	$ 0.00
Balance at end of period (in dollars per share)	$ 8.58