Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Interest rate swap contracts, Current	$ 13,744	$ 16,533
Asset retirement obligations	9,452	9,821
Deferred revenue, Current	2,121	249
Other, Current	1,966	1,634
Total current portion of other long-term liabilities	27,283	28,237
Acquisition-related contingent consideration	37,351
Interest rate swap contracts, Noncurrent	14,295	14,456
Deferred revenue, Noncurrent	1,432	1,698
Other, Noncurrent	12,796	2,537
Total other long-term liabilities	65,874	$ 18,691
Spark ATM Systems
Acquisition-related contingent consideration	$ 37,351