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Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Identifiable assets   $ 721,633 $ 639,671
Current liabilities   $ 100,852 $ 101,363
Accounting Standards Update 2016-02 | Subsequent Event | Forecast      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Identifiable assets $ 8,000