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Basis of Presentation and Significant Accounting Policies (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
extension_option
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Number of extensions (up to) | extension_option 2    
Operating lease right-of-use assets $ 20,306    
Accrued liabilities related to operating leases 4,158   $ 0
Long-term lease obligation related to operating leases $ 16,403    
ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets   $ 20,700  
Accrued liabilities related to operating leases   3,300  
Long-term lease obligation related to operating leases   17,000  
ASU 2016-02, assets reclassified into operating lease right of use assets      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets   2,500  
ASU 2016-02, liabilities reclassified into operating lease right of use assets      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets   $ 2,300  
Minimum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Term of lease option to extend 3 years    
Maximum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Term of lease option to extend 5 years