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Summary of Significant Accounting Policies - Recently Issued Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Recently Issued Accounting Pronouncements
Reduction to retained earnings		$ 461,075	$ 395,961
Forecast Adjustment | ASU 2016-02
Recently Issued Accounting Pronouncements
Leased assets	$ 133,300
Lease liabilities	140,900
Reduction to retained earnings	$ (800)

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Present value of lessee's discounted obligation for lease payments from operating lease.

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