Summary of Significant Accounting Policies - Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings	$ 1,800
Operating lease right-of-use assets, net	59,946	$ 62,922
Operating lease liabilities	$ 67,457	70,657
ASU 2016-02 | Original Allocation Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred rent payable		5,922
ASU 2016-02 | Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets, net		62,922
Operating lease liabilities		70,657
Deferred rent payable		$ (5,922)