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Long-term Incentive Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended 24 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2014
Mar. 21, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 129,700   129,700       92,000
Allocated Share-based Compensation Expense $ 3,372 $ 3,113 $ 6,095 $ 8,354      
Trading Days         20 days    
Share-Based Compensation Arrangements by Share Based Payment Award, Equity Instruments Other than options vested in period     84,500     239,500  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 11,000   $ 11,000        
Omnibus Stock Incentive Plans, 2007 New LTIP [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated Share-based Compensation Expense $ 2,400   $ 4,200        
Common Stock [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     7 months        
Common Stock [Member] | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     3 years        
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plan 17 months            
Performance-Based Awards [Member] | Restricted Stock [Member] | Churchill 2004 and 2007 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number         324,000