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Fair Value Measurements (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Assets and liabilities measured at fair value on a non-recurring basis      
Assets held for sale, net $ 41,391   $ 94,654
Impairment losses 0 $ 2,446  
Assets held for sale, net      
Assets and liabilities measured at fair value on a non-recurring basis      
Assets held for sale, net $ 41,391   $ 94,654