Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019		Jan. 01, 2018	[2]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	$ 140,700	$ 143,600
Lease liability	$ 160,573	143,600
Adjustments to apply recent accounting pronouncements		47,257	[1]	$ 0
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustments to apply recent accounting pronouncements		$ 47,257	[1]	$ 6,689

[1] As a result of accounting guidance adopted in the first quarter of 2019, the remaining deferred gain on a sale-leaseback transaction was recognized as a cumulative-effect adjustment to retained earnings as of January 1, 2019. For further discussion of this guidance, see Note 2, "Recent Accounting Pronouncements."

[2] As a result of accounting guidance adopted in the first quarter of 2018, certain reclassifications were made from accumulated other comprehensive loss to retained earnings as of January 1, 2018.