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General - Basis of Presentation (Details 2) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2017
Feb. 29, 2016
May 31, 2015
Feb. 28, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Effect of dilutive stock options and restricted shares         1,696,000 2,358,000 0 2,246,000        
Share-based Payment Award, Number of Additional Shares Authorized 4,000,000   5,000,000                  
Stock-based Compensation Expense         $ 15,305,000 $ (4,244,000) $ 3,315,000 $ (6,250,000)        
Share-based Payment Award, Options, Outstanding, Number         5,020,000   5,020,000   5,020,000      
Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number         12,000   12,000   12,000      
Share-based Payment Award, Number of Shares Available for Grant         5,590,000   5,590,000   5,590,000      
Employee Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock-based Compensation Expense         $ (15,000) (77,000) $ (115,000) (177,000)        
Long Term Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock-based Compensation Expense         15,320,000 $ (4,167,000) 3,430,000 $ (6,073,000)        
Long Term Incentive Plan [Member] | Performance Award 2015 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share Based Payment Award, Other than Options, Modified EBITDA Performance Target                       $ 500,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   1,314,000   1,511,100                
Stock-based Compensation Expense                   $ 1,600,000    
Long Term Incentive Plan [Member] | Performance Award 2017 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share Based Payment Award, Other than Options, Modified EBITDA Performance Target                     $ 600,000,000  
Share Based Payment Award, Other than Options, Modified EBITDA Performance Target Increase                     1,100,000  
Share Based Payment Award, Other than Options, Modified EBITDA Performance Target Adjusted                     $ 601,100,000  
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Potential Grants Based on Performance Criteria                     2,300,000  
Cumulative Adjustment to Stock-based Compensation Expense             (25,000,000)          
Stock-based Compensation Expense         16,900,000   8,400,000   $ (83,000,000)      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options         17,900,000   17,900,000   17,900,000      
Long Term Incentive Plan [Member] | Dividend Equivalent Rights, Performance Award 2017 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Cumulative Adjustment to Stock-based Compensation Expense             (2,900,000)          
Stock-based Compensation Expense         2,000,000   1,200,000   (9,800,000)      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options         $ 3,300,000   $ 3,300,000   $ 3,300,000