Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accrued Liabilities [Abstract]
Accrued compensation and benefits	$ 38,657	$ 34,107
Accrued interest	16,593	16,553
Dividends payable	12,112	11,548
Deferred rent and unamortized lease incentives	2,471	2,250
Termination benefits	4,041	600
Other liabilities and contingencies	6,514	5,590
Total	$ 80,388	$ 70,648