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Fair Value of Assets and Liabilities (Details) - USD ($)
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 18, 2016
Sep. 25, 2014
Oct. 03, 2013
Mar. 19, 2013
Feb. 10, 2011
Assets:                  
Cash and cash equivalents $ 31,255,000   $ 81,377,000 $ 68,038,000          
5.875% Senior Notes due 2024 | Senior Notes                  
Liabilities:                  
Debt instrument, face amount           $ 250,000,000.0      
Stated interest rate 5.875%   5.875%     5.875%      
5.125% Senior Notes | Senior Notes                  
Liabilities:                  
Debt instrument, face amount               $ 300,000,000.0  
Stated interest rate 5.125%   5.125%         5.125%  
5.875% Senior Notes due 2022 | Senior Notes                  
Liabilities:                  
Debt instrument, face amount             $ 250,000,000.0    
Stated interest rate 5.875%   5.875%            
6.625% Senior Notes | Senior Notes                  
Liabilities:                  
Debt instrument, face amount                 $ 300,000,000
Stated interest rate 6.625%   6.625%         6.00% 6.625%
6.00% Senior Notes | Senior Notes                  
Liabilities:                  
Debt instrument, face amount         $ 350,000,000        
Stated interest rate 6.00%       6.00%        
Carrying Value                  
Assets:                  
Cash and cash equivalents   $ 31,255,000 $ 81,377,000            
Restricted cash and investments   53,217,000 52,168,000            
Liabilities:                  
Borrowings under the Senior Credit Facility   1,273,965,000 1,064,599,000            
Non-recourse debt   340,910,000 393,737,000            
Carrying Value | 5.875% Senior Notes due 2024                  
Liabilities:                  
Senior notes, fair value   250,000,000 250,000,000            
Carrying Value | 5.125% Senior Notes                  
Liabilities:                  
Senior notes, fair value   300,000,000 300,000,000            
Carrying Value | 5.875% Senior Notes due 2022                  
Liabilities:                  
Senior notes, fair value   250,000,000 250,000,000            
Carrying Value | 6.00% Senior Notes                  
Liabilities:                  
Senior notes, fair value   350,000,000 350,000,000            
Fair Value                  
Assets:                  
Cash and cash equivalents   31,255,000 81,377,000            
Restricted cash and investments   53,217,000 52,168,000            
Liabilities:                  
Borrowings under the Senior Credit Facility   1,188,196,000 1,070,514,000            
Non-recourse debt   348,274,000 394,671,000            
Fair Value | 5.875% Senior Notes due 2024                  
Liabilities:                  
Senior notes, fair value   224,590,000 262,095,000            
Fair Value | 5.125% Senior Notes                  
Liabilities:                  
Senior notes, fair value   271,992,000 303,918,000            
Fair Value | 5.875% Senior Notes due 2022                  
Liabilities:                  
Senior notes, fair value   244,550,000 258,338,000            
Fair Value | 6.00% Senior Notes                  
Liabilities:                  
Senior notes, fair value   310,177,000 362,835,000            
Level 1 | Fair Value                  
Assets:                  
Cash and cash equivalents   31,255,000 81,377,000            
Restricted cash and investments   50,499,000 49,884,000            
Liabilities:                  
Borrowings under the Senior Credit Facility   0 0            
Non-recourse debt   0 0            
Level 1 | Fair Value | 5.875% Senior Notes due 2024                  
Liabilities:                  
Senior notes, fair value   0 0            
Level 1 | Fair Value | 5.125% Senior Notes                  
Liabilities:                  
Senior notes, fair value   0 0            
Level 1 | Fair Value | 5.875% Senior Notes due 2022                  
Liabilities:                  
Senior notes, fair value   0 0            
Level 1 | Fair Value | 6.00% Senior Notes                  
Liabilities:                  
Senior notes, fair value   0              
Level 2 | Fair Value                  
Assets:                  
Cash and cash equivalents   0 0            
Restricted cash and investments   2,718,000 2,284,000            
Liabilities:                  
Borrowings under the Senior Credit Facility   1,188,196,000 1,070,514,000            
Non-recourse debt   348,274,000 394,671,000            
Level 2 | Fair Value | 5.875% Senior Notes due 2024                  
Liabilities:                  
Senior notes, fair value   224,590,000 262,095,000            
Level 2 | Fair Value | 5.125% Senior Notes                  
Liabilities:                  
Senior notes, fair value   271,992,000 303,918,000            
Level 2 | Fair Value | 5.875% Senior Notes due 2022                  
Liabilities:                  
Senior notes, fair value   244,550,000 258,338,000            
Level 2 | Fair Value | 6.00% Senior Notes                  
Liabilities:                  
Senior notes, fair value   310,177,000 362,835,000            
Level 3 | Fair Value                  
Assets:                  
Cash and cash equivalents   0 0            
Restricted cash and investments   0 0            
Liabilities:                  
Borrowings under the Senior Credit Facility   0 0            
Non-recourse debt   0 0            
Level 3 | Fair Value | 5.875% Senior Notes due 2024                  
Liabilities:                  
Senior notes, fair value   0 0            
Level 3 | Fair Value | 5.125% Senior Notes                  
Liabilities:                  
Senior notes, fair value   0 0            
Level 3 | Fair Value | 5.875% Senior Notes due 2022                  
Liabilities:                  
Senior notes, fair value   0 $ 0            
Level 3 | Fair Value | 6.00% Senior Notes                  
Liabilities:                  
Senior notes, fair value   $ 0