Segment Information - EBITDA Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Information
Net (loss) income attributable to controlling interests and available to common shareholders	$ (2,768)	$ (901)
Interest expense, net	9,174	6,557
Amortization of deferred financing costs and note discount	3,308	2,976
Income tax benefit	(31)	(2,952)
Depreciation and accretion expense	31,042	29,121
Amortization of intangible assets	13,771	15,180
EBITDA	54,496	49,981
Loss (gain) on disposal and impairment of assets	5,420	3,194
Other expense (income)	2,160	(1,580)
Noncontrolling interests	1	(4)
Share-based compensation expense	2,445	2,197
Acquisition and divestiture-related expenses	1,720	8,456
Redomicile-related expenses		760
Restructuring expenses	2,413	8,243	$ 10,400
Adjusted EBITDA	68,655	71,247
Depreciation and accretion expense	31,041	29,118
Adjusted EBITA	$ 37,614	$ 42,129