Share-Based and Long-Term Compensation Plans - Summary of Share Unit Activity (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Restricted Stock
Number of Shares Activity [Roll Forward]
Balance at beginning of period (in shares)	27,391
Granted	0
Vested (in shares)	(11,633)
Forfeited (in shares)	0
Balance at end of period (in shares)	15,758
Weighted Average Grant-Date Fair Value [Roll Forward]
Balance at beginning of period (in dollars per share)	$ 15.04
Granted	$ 0.00
Vested (in dollars per share)	$ 15.11
Forfeited (in dollars per share)	$ 0.00
Balance at end of period (in dollars per share)	$ 14.99
Deferred Incentive Share Units
Number of Shares Activity [Roll Forward]
Balance at beginning of period (in shares)	14,880
Granted	0
Vested (in shares)	(505)
Forfeited (in shares)	(1,005)
Balance at end of period (in shares)	13,370
Weighted Average Grant-Date Fair Value [Roll Forward]
Balance at beginning of period (in dollars per share)	$ 15.67
Granted	$ 0.00
Vested (in dollars per share)	$ 17.56
Forfeited (in dollars per share)	$ 15.89
Balance at end of period (in dollars per share)	$ 16.91
Stock Options
Number of Shares Activity for Stock Options [Roll Forward]
Balance at beginning of period (in shares)	1,850,000
Granted (in shares)	0
Exercises (in shares)	(462,500)
Forfeited (in shares)	0
Balance at end of period (in shares)	1,387,500
Weighted Average Grante-Date Fair Value for Stock Options [Roll Forward]
Balance at beginning of period (in dollars per share)	$ 4.18
Granted	$ 0.00
Exercises	$ 4.18
Forfeited	$ 0.00
Balance at end of period	$ 4.18
Restricted Stock Units (RSUs)
Number of Shares Activity [Roll Forward]
Balance at beginning of period (in shares)	449,787
Granted	234,021
Vested (in shares)	(55,989)
Forfeited (in shares)	(8,511)
Balance at end of period (in shares)	619,308
Weighted Average Grant-Date Fair Value [Roll Forward]
Balance at beginning of period (in dollars per share)	$ 17.65
Granted	$ 14.34
Vested (in dollars per share)	$ 18.32
Forfeited (in dollars per share)	$ 16.77
Balance at end of period (in dollars per share)	$ 16.36
Profits Interest Units
Number of Shares Activity [Roll Forward]
Balance at beginning of period (in shares)	214,443
Granted	116,134
Vested (in shares)	0
Forfeited (in shares)	0
Balance at end of period (in shares)	330,577
Weighted Average Grant-Date Fair Value [Roll Forward]
Balance at beginning of period (in dollars per share)	$ 9.79
Granted	$ 8.50
Vested (in dollars per share)	$ 0.00
Forfeited (in dollars per share)	$ 0.00
Balance at end of period (in dollars per share)	$ 9.29