Basis of Presentation and Accounting Policies - Adoption of New Accounting Standards (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of accounting principle	$ 25,359	$ (2,467)
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of accounting principle	174,600
Accounting Standards Update 2016-02 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of accounting principle	15,523
Accounting Standards Update 2016-02 | Sale-Leaseback | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of accounting principle	$ 25,400
Accounting Standards Update 2016-16 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of accounting principle		$ (2,467)