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Long-term Incentive Plan (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Mar. 21, 2013
Jun. 30, 2014
Omnibus Stock Incentive Plans, 2007 New LTIP [Member]
Jun. 30, 2014
Omnibus Stock Incentive Plans, 2007 New LTIP [Member]
Jun. 30, 2014
Common Stock [Member]
Minimum
Jun. 30, 2014
Common Stock [Member]
Maximum
Dec. 31, 2013
Performance-Based Awards [Member]
Restricted Stock [Member]
Churchill 2004 and 2007 Plan [Member]
May 29, 2013
Non-Executive Officers [Member]
May 29, 2013
Executive Officers [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         155,000 92,000           14,000 141,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                     324,000    
Trading Days         20                
Allocated Share-based Compensation Expense $ 3,113,000 $ 6,214,000 $ 8,354,000 $ 9,577,000     $ 2,200,000 $ 6,400,000          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options 800,000   800,000                    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 3,800,000   $ 3,800,000                    
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plan                 1 month 23 months