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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncement, Early Adoption
Lease liability	$ 29,798
Right of use assets	29,798
Deferred income taxes	19,749		$ 6,311
Accounting Standards Update 2016-02 \| Minimum
New Accounting Pronouncement, Early Adoption
Lease liability		$ 33,100
Accounting Standards Update 2016-02 \| Maximum
New Accounting Pronouncement, Early Adoption
Right of use assets		$ 33,100
Adjustment \| Accounting Standards Update 2016-02
New Accounting Pronouncement, Early Adoption
Lease liability	33,100
Right of use assets	$ 33,100