Recently Issued and Adopted Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Mar. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
ROU assets	$ 71,480		$ 0	$ 0
Short term lease liabilities	14,300
Long term lease liabilities	60,237		0	0
Cumulative decrease to retained earnings	$ 746,100		$ 787,356	$ 751,801
ASU 2016-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
ROU assets		$ 72,200
Short term lease liabilities		14,900
Long term lease liabilities		60,400
Cumulative decrease to retained earnings		$ (500)