Annual report pursuant to Section 13 and 15(d)

Impairments Impairments Fair Value Nonrecurring (Details)

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Impairments Impairments Fair Value Nonrecurring (Details) - Fair Value, Measurements, Nonrecurring - Long-lived assets held for use - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Assets, fair value $ 311,886 $ 65,203
Level 1    
Property, Plant and Equipment [Line Items]    
Assets, fair value 0 0
Level 2    
Property, Plant and Equipment [Line Items]    
Assets, fair value 0 0
Level 3    
Property, Plant and Equipment [Line Items]    
Assets, fair value $ 311,886 $ 65,203