Description of the Business and Summary of Significant Accounting Policies - Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Liabilities [Abstract]
Pension and postretirement benefits liability	$ 34,712	$ 34,763
Straight-line lease liability	100,068	95,078
Deferred compensation liability	24,687	25,055
Other	1,576	949
Total other liabilities	$ 161,043	$ 155,845