Share-Based and Long-Term Compensation Plans - Summary of Share Unit Activity (Details) (USD $)	6 Months Ended
	Jun. 30, 2014
Restricted Stock
Number of Shares Activity [Roll Forward]
Balance at beginning of period (in shares)	27,391
Granted	0
Vested (in shares)	(10,463)
Forfeited (in shares)	0
Balance at end of period (in shares)	16,928
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)	$ 15.25
Forfeited (in dollars per share)	$ 0.00
Balance at end of period (in dollars per share)	$ 14.86
Deferred Incentive Share Units
Number of Shares Activity [Roll Forward]
Balance at beginning of period (in shares)	14,880
Granted	0
Vested (in shares)	0
Forfeited (in shares)	(880)
Balance at end of period (in shares)	14,000
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)	$ 0.00
Forfeited (in dollars per share)	$ 15.56
Balance at end of period (in dollars per share)	$ 15.68
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)	(27,150)
Forfeited (in shares)	(4,016)
Balance at end of period (in shares)	652,642
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)	$ 19.25
Forfeited (in dollars per share)	$ 12.15
Balance at end of period (in dollars per share)	$ 18.55
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)	$ 9.38