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Recently Issued Accounting Standards - Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepaid and other current assets $ 1,850 $ 1,308 $ 1,456
Operating lease right-of-use assets 15,887 16,470 0
Assets 944,512   917,502
Other Liabilities   22,370 22,644
Other long-term liabilities 1,771 2,441 3,133
Current portion of operating lease obligations 2,653 2,633 0
Obligations under operating leases, net of current portion 13,990 14,655 0
Liabilities $ 716,403   $ 696,010
Accounting Standards Update 2016-02      
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  
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