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Recently Issued Accounting Standards Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Prepaid and other current assets $ 1,596 $ 1,308 $ 1,456  
Operating lease right-of-use assets 22,304 16,470 0  
Assets 1,129,755   917,502 $ 921,533
Accrued and other liabilities   22,370 22,644  
Other long-term liabilities 1,737 2,441 3,133  
Current portion of operating lease obligations 1,554 2,633 0  
Obligations under operating leases, net of current portion 21,533 14,655 0  
Liabilities $ 903,186   $ 696,010  
Accounting Standards Update 2016-02 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Prepaid and other current assets   (148)    
Operating lease right-of-use assets   16,470    
Assets   16,322    
Accrued and other liabilities   (274)    
Other long-term liabilities   (692)    
Current portion of operating lease obligations   2,633    
Obligations under operating leases, net of current portion   14,655    
Liabilities   $ 16,322