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FAIR VALUE MEASUREMENTS AND DISCLOSURES Fair Value Measurements and Disclosures (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure $ 14,338 $ 11,177
Liabilities, Fair Value Disclosure (101,645) (81,190)
Net Asset Fair Value (87,307) (70,013)
Fair Value | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 12,949 6,350
Liabilities, Fair Value Disclosure (90,569) (66,789)
Net Asset Fair Value (77,620) (60,439)
Fair Value | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 1,389 4,827
Liabilities, Fair Value Disclosure (11,076) (14,401)
Net Asset Fair Value (9,687) $ (9,574)
1.125% Convertible Senior Notes due 2021 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes fair value $ 195,600  
Notes fair value as percentage of par 97.80%  
6.125% Senior Notes due 2024 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes fair value $ 416,000  
Notes fair value as percentage of par 104.00%  
5.75% Senior Notes due 2026 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes fair value $ 616,500  
Notes fair value as percentage of par 102.80%