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Fair Value of Assets and Liabilities (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Sep. 25, 2014
Dec. 31, 2013
Oct. 03, 2013
Mar. 19, 2013
Dec. 31, 2012
Feb. 10, 2011
Assets:                
Cash and cash equivalents $ 59,638,000 $ 41,337,000   $ 52,125,000     $ 31,755,000  
5.875% Senior Notes due 2024 | Senior Notes                
Liabilities:                
Stated interest rate 5.875% 5.875% 5.875%     5.875%    
5.125% Senior Notes | Senior Notes                
Liabilities:                
Debt instrument, face amount     $ 250,000,000.0     $ 300,000,000.0    
Stated interest rate 5.125% 5.125%       5.125%    
5.875% Senior Notes | Senior Notes                
Liabilities:                
Debt instrument, face amount         $ 250,000,000.0      
Stated interest rate 5.875% 5.875%       587500.00%    
6.625% Senior Notes | Senior Notes                
Liabilities:                
Debt instrument, face amount               $ 300,000,000.0
Stated interest rate 6.625% 6.625% 6.625%     6.625%   6.625%
Carrying Value                
Assets:                
Cash and cash equivalents $ 59,638,000 $ 41,337,000            
Restricted cash 15,654,000 12,638,000            
Liabilities:                
Borrowings under the Senior Credit Facility 777,500,000 365,500,000            
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                
Liabilities:                
Debt instrument, face amount 250,000,000 300,000,000            
Carrying Value | 6.625% Senior Notes                
Liabilities:                
Debt instrument, face amount 300,000,000 250,000,000            
Carrying Value | Other non recourse debt including current portion                
Liabilities:                
Non-recourse debt 42,592,000 48,836,000            
Fair Value                
Assets:                
Cash and cash equivalents 59,638,000 41,337,000            
Restricted cash 15,654,000 12,638,000            
Liabilities:                
Borrowings under the Senior Credit Facility 777,500,000 364,411,000            
Fair Value | 5.875% Senior Notes due 2024                
Liabilities:                
Debt Instrument, Fair Value Disclosure 245,783,000 256,720,000            
Fair Value | 5.125% Senior Notes                
Liabilities:                
Debt Instrument, Fair Value Disclosure 285,189,000 315,750,000            
Fair Value | 5.875% Senior Notes                
Liabilities:                
Debt Instrument, Fair Value Disclosure 248,125,000 296,814,000            
Fair Value | 6.625% Senior Notes                
Liabilities:                
Debt Instrument, Fair Value Disclosure 308,625,000 256,720,000            
Fair Value | Other non recourse debt including current portion                
Liabilities:                
Non-recourse debt 43,353,000 52,016,000            
Level 1 | Fair Value                
Assets:                
Cash and cash equivalents 59,638,000 41,337,000            
Restricted cash 11,536,000 3,889,000            
Liabilities:                
Borrowings under the Senior Credit Facility 0 0            
Level 1 | Fair Value | 5.875% Senior Notes due 2024                
Liabilities:                
Debt Instrument, Fair Value Disclosure 0              
Level 1 | Fair Value | 5.875% Senior Notes                
Liabilities:                
Debt Instrument, Fair Value Disclosure 0 0            
Level 1 | Fair Value | 6.625% Senior Notes                
Liabilities:                
Debt Instrument, Fair Value Disclosure 0 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 4,118,000 8,749,000            
Liabilities:                
Borrowings under the Senior Credit Facility 777,500,000 364,411,000            
Level 2 | Fair Value | 5.875% Senior Notes due 2024                
Liabilities:                
Debt Instrument, Fair Value Disclosure 245,783,000 256,720,000            
Level 2 | Fair Value | 5.125% Senior Notes                
Liabilities:                
Debt Instrument, Fair Value Disclosure 285,189,000 315,750,000            
Level 2 | Fair Value | 5.875% Senior Notes                
Liabilities:                
Debt Instrument, Fair Value Disclosure 248,125,000 296,814,000            
Level 2 | Fair Value | 6.625% Senior Notes                
Liabilities:                
Debt Instrument, Fair Value Disclosure 308,625,000 256,720,000            
Level 2 | Fair Value | Other non recourse debt including current portion                
Liabilities:                
Non-recourse debt 43,353,000 52,016,000            
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:                
Debt Instrument, Fair Value Disclosure 0              
Level 3 | Fair Value | 5.875% Senior Notes                
Liabilities:                
Debt Instrument, Fair Value Disclosure 0 0            
Level 3 | Fair Value | 6.625% Senior Notes                
Liabilities:                
Debt Instrument, Fair Value Disclosure 0 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 204,539,000 95,714,000            
AUSTRALIA | Subsidiaries | Fair Value                
Liabilities:                
Non-recourse debt 204,531,000 95,871,000            
AUSTRALIA | Level 1 | Subsidiaries | Fair Value                
Liabilities:                
Non-recourse debt 0 0            
AUSTRALIA | Level 2 | Subsidiaries | Fair Value                
Liabilities:                
Non-recourse debt 204,531,000 95,871,000            
AUSTRALIA | Level 3 | Subsidiaries | Fair Value                
Liabilities:                
Non-recourse debt $ 0 $ 0