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Summary of Significant Accounting Policies - Newly Adopted Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jan. 01, 2019
Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease assets $ 180,600 $ 175,878
Present value of lease liabilities   $ 177,422
Straight-line rent liability 5,100  
Prepaid rent 4,900  
us-gaap_LeaseCostTableTextBlock   The table below presents the weighted-average remaining lease term (years) of our operating leases and the weighted-average discount rate used in the above calculation:
September 30,
Lease Term and Discount Rate  2019
Weighted-average remaining lease term (years) 
Operating leases  4.55
Weighted-average discount rate  
Operating leases  3.47 %
us-gaap_LeaseCostTableTextBlock1  
The table below presents the amount of cash paid for amounts included in the measurement of lease liabilities (in thousands):
Nine Months Ended
September 30,
2019
Operating cash flows for lease liabilities$42,167  
Accounting Standards Update 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease assets 175,700  
Present value of lease liabilities $ 181,600