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Equity-based Compensation Plans - CWGS LLC Plan (Details)
1 Months Ended 12 Months Ended
Oct. 06, 2016
shares
Apr. 04, 2016
USD ($)
shares
Apr. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2012
Share-based Compensation Plans              
Share based compensation expense       $ 1,597,000      
Profit Units redeemed       17,000,000      
Interest paid       61,889,000 $ 57,717,000 $ 54,843,000  
CWGS LLC Plan              
Share-based Compensation Plans              
Percentage of increase in the value of the Company (as a percent)             10.00%
Vesting period             4 years
Share based compensation expense         $ 0 $ 0  
CWGS LLC Plan | Class A common stock              
Share-based Compensation Plans              
Exchange ratio for converting common units 1            
CWGS LLC Plan | Board of Directors Chairman              
Share-based Compensation Plans              
Share based compensation expense       $ 60,000      
CWGS LLC Plan | Board of Directors Chairman | Notes Payable, Other Payables | Note Payable to Board of Directors Chairman and Chief Executive Officer              
Share-based Compensation Plans              
Profit Units redeemed, note payable portion   $ 4,000,000          
Interest rate (as a percent)   3.00%          
Principal payment   $ 1,500,000          
Principal payment frequency   May 1, 2016 and June 1, 2016          
Interest paid     $ 6,250        
CWGS LLC Plan | Profits Units              
Share-based Compensation Plans              
Granted/issued (in units) | shares       0 15,556 0  
Outstanding (in units) | shares 13,793     0 15,556    
Authorized (in units) | shares         15,556    
Grant date fair value (per unit) | $ / shares         $ 317    
Share based compensation expense       $ 889,000      
Units issued in exchange | shares 5,877,513            
Profit units available for grant | shares       0      
CWGS LLC Plan | Profits Units | Board of Directors Chairman              
Share-based Compensation Plans              
Profit Units redeemed (in shares) | shares   1,763          
Profit Units redeemed   $ 17,000,000          
Profit Units redeemed, cash portion   $ 13,000,000