Share-Based and Long-Term Compensation Plans - Summary of Share Unit Activity (Details)	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Restricted Shares
Number of Shares
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
Balance at beginning of period (in dollars per share) | $ / shares	$ 14.61
Granted (in dollars per share) | $ / shares	0.00
Vested/Exercised (in dollars per share) | $ / shares	15.13
Forfeited (in dollars per share) | $ / shares	0.00
Balance at end of period (in dollars per share) | $ / shares	$ 13.82
Deferred Incentive Share Units
Number of Shares
Balance at beginning of period (in shares)	6,855
Granted (in shares)	0
Vested/Exercised (in shares)	(5,745)
Forfeited (in shares)	(630)
Balance at end of period (in shares)	480
Weighted Average Grant-Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 16.63
Granted (in dollars per share) | $ / shares	0.00
Vested/Exercised (in dollars per share) | $ / shares	17.56
Forfeited (in dollars per share) | $ / shares	13.34
Balance at end of period (in dollars per share) | $ / shares	$ 9.86
Stock Options
Number of Options
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 Grant-Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 4.17
Granted (in dollars per share) | $ / shares	0.00
Vested/Exercised (in dollars per share) | $ / shares	4.18
Forfeited (in dollars per share) | $ / shares	0.00
Balance at end of period (in dollars per share) | $ / shares	$ 4.18
RSUs
Number of Shares
Balance at beginning of period (in shares)	504,534
Granted (in shares)	267,596
Vested/Exercised (in shares)	(88,752)
Forfeited (in shares)	0
Balance at end of period (in shares)	683,378
Weighted Average Grant-Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 16.03
Granted (in dollars per share) | $ / shares	13.50
Vested/Exercised (in dollars per share) | $ / shares	18.34
Forfeited (in dollars per share) | $ / shares	0.00
Balance at end of period (in dollars per share) | $ / shares	$ 14.74
LTIP Units
Number of Shares
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
Balance at beginning of period (in dollars per share) | $ / shares	$ 9.26
Granted (in dollars per share) | $ / shares	7.18
Vested/Exercised (in dollars per share) | $ / shares	0.00
Forfeited (in dollars per share) | $ / shares	0.00
Balance at end of period (in dollars per share) | $ / shares	$ 8.58