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Long-term Incentive Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended 24 Months Ended
Sep. 22, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2014
Mar. 21, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unvested compensation expense   $ 8,800   $ 8,800        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   129,700   129,700       92,000
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  
Allocated Share-based Compensation Expense   $ 4,485 $ 2,213 $ 10,580 $ 10,567      
Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period under adopted ELTI Plan 30 months              
Omnibus Stock Incentive Plans, 2007 New LTIP [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Allocated Share-based Compensation Expense   3,000   7,200        
Restricted Stock Units (RSUs) [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of units received by NEOs and Grantees under adopted ELTI Plan (in shares) 22,142              
Unvested compensation expense   3,000   $ 3,000        
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plan       21 months        
Performance Share Units [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period under adopted ELTI Plan 30 months              
Number of units received by NEOs and Grantees under adopted ELTI Plan (in shares) 22,142              
Maximum number of performance share units as percentage of original award (in percent) 250.00%              
Unvested compensation expense   $ 3,400   $ 3,400        
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plan       27 months        
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   29,218   29,218        
Allocated Share-based Compensation Expense       $ 1,300        
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   14 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