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Other Assets and Accrued Liabilities - Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]      
Prepaid rent $ 0   $ 11,245
Prepaid maintenance expenses 3,788   3,981
Interest rate swaps 1,483   4,930
Wireless contract asset 41,878   33,323
Contract acquisition and fulfillment costs 4,861   4,634
Other 4,587   2,049
Prepaid expenses and other $ 56,597 $ 48,582 $ 60,162