Share-Based and Long-Term Compensation Plans - Summary of Share Unit Activity (Details)	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Restricted Shares
Number of Shares
Balance at beginning of period (in shares) | shares	5,189
Granted (in shares) | shares	0
Vested/Exercised (in shares) | shares	(5,189)
Forfeited (in shares) | shares	0
Balance at end of period (in shares) | shares	0
Weighted Average Grant-Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 13.65
Granted (in dollars per share) | $ / shares	0.00
Vested/Exercised (in dollars per share) | $ / shares	13.65
Forfeited (in dollars per share) | $ / shares	0.00
Balance at end of period (in dollars per share) | $ / shares	$ 0.00
Stock Options
Number of Options
Balance at beginning of period (in shares) | shares	1,293,750
Granted (in shares) | shares	0
Vested/Exercises (in shares) | shares	(431,250)
Forfeited (in shares) | shares	0
Balance at end of period (in shares) | 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	4.17
Forfeited (in dollars per share) | $ / shares	0.00
Balance at end of period (in dollars per share) | $ / shares	$ 4.17
LTIP Units
Number of Shares
Balance at beginning of period (in shares) | shares	447,938
Granted (in shares) | shares	206,640
Vested/Exercised (in shares) | shares	0
Forfeited (in shares) | shares	0
TSR Not Achieved (in shares) | shares	(99,502)
Balance at end of period (in shares) | shares	555,076
Weighted Average Grant-Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 8.58
Granted (in dollars per share) | $ / shares	4.77
Vested/Exercised (in dollars per share) | $ / shares	0.00
Forfeited (in dollars per share) | $ / shares	0.00
TSR Not Achieved (in dollars per share) | $ / shares	10.60
Balance at end of period (in dollars per share) | $ / shares	$ 6.80
Time-Vesting RSUs | Restricted Stock Units
Number of Shares
Balance at beginning of period (in shares) | shares	386,748
Granted (in shares) | shares	247,520
Vested/Exercised (in shares) | shares	(93,904)
Forfeited (in shares) | shares	(3,600)
Balance at end of period (in shares) | shares	536,764
Weighted Average Grant-Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 18.09
Granted (in dollars per share) | $ / shares	12.47
Vested/Exercised (in dollars per share) | $ / shares	18.21
Forfeited (in dollars per share) | $ / shares	14.13
Balance at end of period (in dollars per share) | $ / shares	$ 15.51
Performance-Vesting RSUs | Restricted Stock Units
Number of Shares
Balance at beginning of period (in shares) | shares	215,527
Granted (in shares) | shares	164,640
Vested/Exercised (in shares) | shares	0
Forfeited (in shares) | shares	(6,000)
TSR Not Achieved (in shares) | shares	(37,927)
Balance at end of period (in shares) | shares	336,240
Weighted Average Grant-Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 8.11
Granted (in dollars per share) | $ / shares	4.66
Vested/Exercised (in dollars per share) | $ / shares	0.00
Forfeited (in dollars per share) | $ / shares	5.57
TSR Not Achieved (in dollars per share) | $ / shares	10.50
Balance at end of period (in dollars per share) | $ / shares	$ 6.20