Other Liabilities - Components of Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Deferred rental income	$ 43,923	$ 35,904
Fair value of interest rate swaps	2,447	6,991
Income taxes payable	1,695	2,223
Deferred tax liability	9,838	10,728
Earnout provisions on acquisitions	5,184	5,510
Unpaid claims liability	10,134	11,313
Other miscellaneous liabilities	14,448	7,820
Other liabilities, Total	$ 87,669	$ 80,489