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