Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accrued Liabilities [Abstract]
Accrued compensation and benefits	$ 42,518	$ 34,761
Accrued interest	16,640	16,539
Dividends payable	11,977	12,185
Deferred rent and unamortized lease incentives	2,772	2,620
Termination benefits	744	3,333
Income taxes payable	0	2,776
Other liabilities and contingencies	18,000	12,101
Total	$ 92,651	$ 84,315