Summary Of Major Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Jan. 01, 2019	Jan. 01, 2018
Property, Plant and Equipment [Line Items]
Interest costs capitalized		$ 2,000	$ 1,600
Business acquisitions, net of cash acquired	$ 68,000	0	$ 68,398
Goodwill, impairment loss				$ 76,000
Cumulative effect of new accounting principle in period of adoption					$ (5,860)	$ (537)
Lease assets		182,311			184,648
Lease, liability		$ 186,454			190,508
Lease, term of contract		22 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Threshold for consolidation, percentage		50.00%
Equity method investment, threshold for consolidation, percentage		20.00%
Maximum [Member]
Property, Plant and Equipment [Line Items]
Equity method investment, threshold for consolidation, percentage		50.00%
Retained Earnings [Member]
Property, Plant and Equipment [Line Items]
Cumulative effect of new accounting principle in period of adoption					(5,860)	(537)
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
Property, Plant and Equipment [Line Items]
Cumulative effect of new accounting principle in period of adoption						$ 537
Accounting Standards Update 2016-02 [Member] | Retained Earnings [Member]
Property, Plant and Equipment [Line Items]
Cumulative effect of new accounting principle in period of adoption					$ 5,900