Share-Based and Long-Term Compensation Plans - Summary of Non-vested Shares Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Restricted Shares
Restricted shares, deferred incentive share units, restricted stock units and LTIP units activity [Roll Forward]
Balance at beginning of period (in shares)	27,391
Granted (in shares)	0
Vested (in shares)	(12,477)
Forfeited (in shares)	(1,145)
Balance at end of period (in shares)	13,769
Restricted shares, deferred incentive share units, restricted stock units and LTIP units - Weighted Average Grant Date Fair Value [Abstract]
Balance at beginning of period , Weighted Average Grant Date Fair Value	$ 15.04
Granted, Weighted Average Grant Date Fair Value	$ 0.00
Vested, Weighted Average Grant Date Fair Value	$ 15.28
Forfeited, Weighted Average Grant Date Fair Value	$ 17.56
Balance at end of period , Weighted Average Grant Date Fair Value	$ 14.61
Deferred Incentive Share Units
Restricted shares, deferred incentive share units, restricted stock units and LTIP units activity [Roll Forward]
Balance at beginning of period (in shares)	14,880
Granted (in shares)	0
Vested (in shares)	(1,605)
Forfeited (in shares)	(6,420)
Balance at end of period (in shares)	6,855
Restricted shares, deferred incentive share units, restricted stock units and LTIP units - Weighted Average Grant Date Fair Value [Abstract]
Balance at beginning of period , Weighted Average Grant Date Fair Value	$ 15.67
Granted, Weighted Average Grant Date Fair Value	$ 0.00
Vested, Weighted Average Grant Date Fair Value	$ 16.50
Forfeited, Weighted Average Grant Date Fair Value	$ 17.20
Balance at end of period , Weighted Average Grant Date Fair Value	$ 16.63
Stock Options
Shares [Roll Forward]
Outstanding at beginning of period (in shares)	1,850,000
Granted (in shares)	0
Vested (in shares)	(493,750)
Forfeited (in shares)	(62,500)
Outstanding at end of period (in shares)	1,293,750
Weighted Average Price [Rollforward]
Balance at beginning of period, Weighted Average Exercise Price	$ 4.17
Granted, Weighted Average Exercise Price	$ 0.00
Vested, Weighted Average Exercise Price	$ 4.17
Forfeited (in dollars per share)	$ 4.17
Balance at end of period, Weighted Average Exercise Price	$ 4.17
Restricted Stock Units
Restricted shares, deferred incentive share units, restricted stock units and LTIP units activity [Roll Forward]
Balance at beginning of period (in shares)	449,787
Granted (in shares)	234,021
Vested (in shares)	(132,657)
Forfeited (in shares)	(46,618)
Balance at end of period (in shares)	504,533
Restricted shares, deferred incentive share units, restricted stock units and LTIP units - Weighted Average Grant Date Fair Value [Abstract]
Balance at beginning of period , Weighted Average Grant Date Fair Value	$ 17.65
Granted, Weighted Average Grant Date Fair Value	$ 14.34
Vested, Weighted Average Grant Date Fair Value	$ 18.51
Forfeited, Weighted Average Grant Date Fair Value	$ 16.20
Balance at end of period , Weighted Average Grant Date Fair Value	$ 16.03
LTIP Units
Restricted shares, deferred incentive share units, restricted stock units and LTIP units activity [Roll Forward]
Balance at beginning of period (in shares)	214,443
Granted (in shares)	116,134
Vested (in shares)	0
Forfeited (in shares)	(29,941)
Balance at end of period (in shares)	300,636
Restricted shares, deferred incentive share units, restricted stock units and LTIP units - Weighted Average Grant Date Fair Value [Abstract]
Balance at beginning of period , Weighted Average Grant Date Fair Value	$ 9.79
Granted, Weighted Average Grant Date Fair Value	$ 8.50
Vested, Weighted Average Grant Date Fair Value	$ 0.00
Forfeited, Weighted Average Grant Date Fair Value	$ 9.55
Balance at end of period , Weighted Average Grant Date Fair Value	$ 9.26