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Fair Value of Assets and Liabilities (Details) - USD ($)
Dec. 31, 2016
Apr. 18, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 25, 2014
Dec. 31, 2013
Oct. 03, 2013
Mar. 19, 2013
Feb. 10, 2011
Assets:                  
Cash and cash equivalents $ 68,038,000   $ 59,638,000 $ 41,337,000   $ 52,125,000      
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% 6.625%   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 $ 68,038,000   $ 59,638,000            
Restricted cash 22,319,000   15,654,000            
Liabilities:                  
Borrowings under the Senior Credit Facility 804,500,000   777,500,000            
Carrying Value | 5.875% Senior Notes due 2024                  
Liabilities:                  
Debt instrument, face amount 250,000,000   250,000,000            
Carrying Value | 5.125% Senior Notes                  
Liabilities:                  
Debt instrument, face amount 300,000,000   300,000,000            
Carrying Value | 5.875% Senior Notes due 2022                  
Liabilities:                  
Debt instrument, face amount 250,000,000   300,000,000            
Carrying Value | 6.625% Senior Notes                  
Liabilities:                  
Debt instrument, face amount     250,000,000            
Carrying Value | 6.00% Senior Notes                  
Liabilities:                  
Debt instrument, face amount 350,000,000                
Carrying Value | Other non recourse debt including current portion                  
Liabilities:                  
Non-recourse debt 36,280,000   42,592,000            
Fair Value                  
Assets:                  
Cash and cash equivalents 68,038,000   59,638,000            
Restricted cash 22,319,000   15,654,000            
Liabilities:                  
Borrowings under the Senior Credit Facility 795,008,000   777,500,000            
Fair Value | 5.875% Senior Notes due 2024                  
Liabilities:                  
Senior notes, fair value 247,813,000   245,783,000            
Fair Value | 5.125% Senior Notes                  
Liabilities:                  
Senior notes, fair value 292,125,000   308,625,000            
Fair Value | 5.875% Senior Notes due 2022                  
Liabilities:                  
Senior notes, fair value 254,688,000   285,189,000            
Fair Value | 6.625% Senior Notes                  
Liabilities:                  
Senior notes, fair value     248,125,000            
Fair Value | 6.00% Senior Notes                  
Liabilities:                  
Senior notes, fair value 346,938,000                
Fair Value | Other non recourse debt including current portion                  
Liabilities:                  
Non-recourse debt 37,550,000   43,353,000            
Level 1 | Fair Value                  
Assets:                  
Cash and cash equivalents 68,038,000   59,638,000            
Restricted cash 19,614,000   11,536,000            
Liabilities:                  
Borrowings under the Senior Credit Facility 0   0            
Level 1 | Fair Value | 5.875% Senior Notes due 2024                  
Liabilities:                  
Senior notes, fair value 0                
Level 1 | Fair Value | 5.875% Senior Notes due 2022                  
Liabilities:                  
Senior notes, fair value 0   0            
Level 1 | Fair Value | 6.625% Senior Notes                  
Liabilities:                  
Senior notes, fair value     0            
Level 1 | Fair Value | 6.00% Senior Notes                  
Liabilities:                  
Senior notes, fair value 0                
Level 1 | Fair Value | Other non recourse debt including current portion                  
Liabilities:                  
Non-recourse debt 0   0            
Level 2 | Fair Value                  
Assets:                  
Cash and cash equivalents 0   0            
Restricted cash 2,705,000   4,118,000            
Liabilities:                  
Borrowings under the Senior Credit Facility 795,008,000   777,500,000            
Level 2 | Fair Value | 5.875% Senior Notes due 2024                  
Liabilities:                  
Senior notes, fair value 247,813,000   245,783,000            
Level 2 | Fair Value | 5.125% Senior Notes                  
Liabilities:                  
Senior notes, fair value 292,125,000   308,625,000            
Level 2 | Fair Value | 5.875% Senior Notes due 2022                  
Liabilities:                  
Senior notes, fair value 254,688,000   285,189,000            
Level 2 | Fair Value | 6.625% Senior Notes                  
Liabilities:                  
Senior notes, fair value     248,125,000            
Level 2 | Fair Value | 6.00% Senior Notes                  
Liabilities:                  
Senior notes, fair value 346,938,000                
Level 2 | Fair Value | Other non recourse debt including current portion                  
Liabilities:                  
Non-recourse debt 37,550,000   43,353,000            
Level 3 | Fair Value                  
Assets:                  
Cash and cash equivalents 0   0            
Restricted cash 0   0            
Liabilities:                  
Borrowings under the Senior Credit Facility 0   0            
Level 3 | Fair Value | 5.875% Senior Notes due 2024                  
Liabilities:                  
Senior notes, fair value 0                
Level 3 | Fair Value | 5.875% Senior Notes due 2022                  
Liabilities:                  
Senior notes, fair value 0   0            
Level 3 | Fair Value | 6.625% Senior Notes                  
Liabilities:                  
Senior notes, fair value     0            
Level 3 | Fair Value | 6.00% Senior Notes                  
Liabilities:                  
Senior notes, fair value 0                
Level 3 | Fair Value | Other non recourse debt including current portion                  
Liabilities:                  
Non-recourse debt 0   0            
AUSTRALIA | Subsidiaries | Carrying Value                  
Liabilities:                  
Non-recourse debt 454,222,000   204,539,000            
AUSTRALIA | Subsidiaries | Fair Value                  
Liabilities:                  
Non-recourse debt 454,185,000   204,531,000            
AUSTRALIA | Level 1 | Subsidiaries | Fair Value                  
Liabilities:                  
Non-recourse debt 0   0            
AUSTRALIA | Level 2 | Subsidiaries | Fair Value                  
Liabilities:                  
Non-recourse debt 454,185,000   204,531,000            
AUSTRALIA | Level 3 | Subsidiaries | Fair Value                  
Liabilities:                  
Non-recourse debt $ 0   $ 0