Leased Property (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leased Property      
Right of use assets - operating $ 76,747    
Right of use asset - finance 39,905    
Capitalized costs of lessor assets 41,040 $ 98,877  
Less: accumulated depreciation (10,941) (11,812)  
Leased property, net 146,751 87,065  
Depreciation $ 8,400 $ 7,300 $ 2,900