Share-Based Compensation - Multi-Year Outperformance Plan Agreement (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	0 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 New Multi-Year Outperformance Plan	Apr. 15, 2014 New Multi-Year Outperformance Plan Performance Shares	Jun. 30, 2014 New Multi-Year Outperformance Plan Performance Shares	Apr. 15, 2014 New Multi-Year Outperformance Plan Performance Shares	Jun. 30, 2014 New Multi-Year Outperformance Plan Performance Shares Performance Period	Jun. 30, 2014 New Multi-Year Outperformance Plan Performance Shares Annual Period	Jun. 30, 2014 New Multi-Year Outperformance Plan Performance Shares Interim Period	Jun. 30, 2014 Relative Component Excess Return, Above Peer Group New Multi-Year Outperformance Plan Performance Shares	Jun. 30, 2014 Relative Component Cumulative Return, Above Threshold New Multi-Year Outperformance Plan Performance Shares	Jun. 30, 2014 Relative Component Cumulative Return, Above Threshold New Multi-Year Outperformance Plan Performance Shares Minimum Performance Period	Jun. 30, 2014 Relative Component Cumulative Return, Above Threshold New Multi-Year Outperformance Plan Performance Shares Minimum Annual Period	Jun. 30, 2014 Relative Component Cumulative Return, Above Threshold New Multi-Year Outperformance Plan Performance Shares Minimum Interim Period	Jun. 30, 2014 Relative Component Cumulative Return, Above Threshold New Multi-Year Outperformance Plan Performance Shares Maximum Performance Period	Jun. 30, 2014 Relative Component Cumulative Return, Above Threshold New Multi-Year Outperformance Plan Performance Shares Maximum Annual Period	Jun. 30, 2014 Relative Component Cumulative Return, Above Threshold New Multi-Year Outperformance Plan Performance Shares Maximum Interim Period	Jun. 30, 2014 Relative Component Cumulative Return, Equal to Threshold New Multi-Year Outperformance Plan Performance Shares	Jun. 30, 2014 Relative Component Cumulative Return, Below Threshold New Multi-Year Outperformance Plan Performance Shares	Jun. 30, 2014 Absolute Component Excess Return, Above Threshold New Multi-Year Outperformance Plan Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Opp units issued (in shares)								$ 8,880,579
Company's market capitalization percentage						5.00%
Share-based payment award, award vesting rights							33.33%
Absolute Component: 4% of any excess Total Return attained above an absolute hurdle measured from the beginning of such period:									21.00%	7.00%	14.00%
100% will be earned if cumulative Total Return achieved is at least:									18.00%	6.00%	12.00%
50% will be earned if cumulative Total Return achieved is:									0.00%	0.00%	0.00%
0% will be earned if cumulative Total Return achieved is less than:									0.00%	0.00%	0.00%
Return percentage threshold														0.00%	0.00%	0.00%	18.00%	6.00%	12.00%
Shares authorized, percentage of benchmark												4.00%										4.00%
Shares awarded as a percentage of maximum													100.00%							50.00%	0.00%
Distribution Entitlement Percentage							10.00%
Equity-based compensation	$ 1,882,000	$ 13,000	$ 1,898,000	$ 24,000	$ 1,800,000