Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 7,469	$ 3,045	$ 6,375		$ 7,776
Accounts receivable	51,952	59,118
Prepaid and other current assets	4,779	4,311
Total current assets	64,200	66,474
Properties and equipment, net	1,478,950	1,538,655
Net Investment in Lease, Noncurrent	136,394	16,488
Operating lease right-of-use assets	3,454	0
Net Investment in Lease	136,394
Investment in subsidiaries	0	0
Intangible assets, net	104,824	115,329
Goodwill	270,336	270,336
Equity method investments	82,884	83,840
Other assets	13,233	11,418
Assets	2,154,275	2,102,540
Current liabilities:
Accounts payable	19,355	30,657
Due to Affiliate	6,700	14,200
Accrued interest	5,884	13,302
Deferred revenue	9,774	8,697		$ 8,278
Accrued property taxes	9,266	1,779
Other Sundry Liabilities, Current		2,526
Current maturities of operating leases	807	0
Current maturities of finance leases	5,426	936
Other current liabilities	2,926	2,526
Total current liabilities	53,438	57,897
Long-term debt	1,431,869	1,418,900
Noncurrent operating lease liabilities	2,995	0
Noncurrent finance lease liabilities	69,168	867
Other long-term liabilities	12,902	14,440
Deferred revenue	46,862	48,714
Class B unit	48,557	46,161
Equity - partners	404,584	427,435
Equity - noncontrolling interest	83,900	88,126
Total liabilities and equity	2,154,275	2,102,540
Parent
Current assets:
Cash and cash equivalents	5,603	2	2		2
Accounts receivable	0	0
Prepaid and other current assets	145	217
Total current assets	5,748	219
Properties and equipment, net	0	0
Net Investment in Lease, Noncurrent		0
Operating lease right-of-use assets	0
Net Investment in Lease	0
Investment in subsidiaries	1,829,611	1,850,416
Intangible assets, net	0	0
Goodwill	0	0
Equity method investments	0	0
Other assets	7,334	9,291
Assets	1,842,693	1,859,926
Current liabilities:
Accounts payable	0	0
Accrued interest	5,884	13,302
Deferred revenue	0	0
Accrued property taxes	0	0
Other Sundry Liabilities, Current		29
Current maturities of operating leases	0
Current maturities of finance leases	0	0
Other current liabilities	96
Total current liabilities	5,980	13,331
Long-term debt	1,431,869	1,418,900
Noncurrent operating lease liabilities	0
Noncurrent finance lease liabilities	0	0
Other long-term liabilities	260	260
Deferred revenue	0	0
Class B unit	0	0
Equity - partners	404,584	427,435
Equity - noncontrolling interest	0	0
Total liabilities and equity	1,842,693	1,859,926
Guarantor Restricted Subsidiaries
Current assets:
Cash and cash equivalents	(1,043)	0	1,639		511
Accounts receivable	46,995	53,376
Prepaid and other current assets	4,335	3,542
Total current assets	50,287	56,918
Properties and equipment, net	1,144,873	1,193,181
Net Investment in Lease, Noncurrent		16,488
Operating lease right-of-use assets	3,424
Net Investment in Lease	136,394
Investment in subsidiaries	251,700	264,378
Intangible assets, net	104,824	115,329
Goodwill	270,336	270,336
Equity method investments	82,884	83,840
Other assets	5,899	2,127
Assets	2,050,621	2,002,597
Current liabilities:
Accounts payable	18,055	30,325
Accrued interest	0	0
Deferred revenue	8,964	8,065
Accrued property taxes	5,131	744
Other Sundry Liabilities, Current		2,493
Current maturities of operating leases	777
Current maturities of finance leases	5,426	936
Other current liabilities	2,830
Total current liabilities	41,183	42,563
Long-term debt	0	0
Noncurrent operating lease liabilities	2,995
Noncurrent finance lease liabilities	69,168	867
Other long-term liabilities	12,245	13,876
Deferred revenue	46,862	48,714
Class B unit	48,557	46,161
Equity - partners	1,829,611	1,850,416
Equity - noncontrolling interest	0	0
Total liabilities and equity	2,050,621	2,002,597
Non-Guarantor Non-Restricted Subsidiaries
Current assets:
Cash and cash equivalents	2,909	3,043	4,734		7,263
Accounts receivable	5,218	5,994
Prepaid and other current assets	299	552
Total current assets	8,426	9,589
Properties and equipment, net	334,077	345,474
Net Investment in Lease, Noncurrent		0
Operating lease right-of-use assets	30
Net Investment in Lease	0
Investment in subsidiaries	0	0
Intangible assets, net	0	0
Goodwill	0	0
Equity method investments	0	0
Other assets	0	0
Assets	342,533	355,063
Current liabilities:
Accounts payable	1,561	584
Accrued interest	0	0
Deferred revenue	810	632
Accrued property taxes	4,135	1,035
Other Sundry Liabilities, Current		4
Current maturities of operating leases	30
Current maturities of finance leases	0	0
Other current liabilities	0
Total current liabilities	6,536	2,255
Long-term debt	0	0
Noncurrent operating lease liabilities	0
Noncurrent finance lease liabilities	0	0
Other long-term liabilities	397	304
Deferred revenue	0	0
Class B unit	0	0
Equity - partners	251,700	264,378
Equity - noncontrolling interest	83,900	88,126
Total liabilities and equity	342,533	355,063
Eliminations
Current assets:
Cash and cash equivalents	0	0	$ 0		$ 0
Accounts receivable	(261)	(252)
Prepaid and other current assets		0
Total current assets	(261)	(252)
Properties and equipment, net	0	0
Net Investment in Lease, Noncurrent		0
Operating lease right-of-use assets	0
Net Investment in Lease	0
Investment in subsidiaries	(2,081,311)	(2,114,794)
Intangible assets, net	0	0
Goodwill	0	0
Equity method investments	0	0
Other assets	0	0
Assets	(2,081,572)	(2,115,046)
Current liabilities:
Accounts payable	(261)	(252)
Accrued interest	0	0
Deferred revenue	0	0
Accrued property taxes	0	0
Other Sundry Liabilities, Current		0
Current maturities of operating leases	0
Current maturities of finance leases	0	0
Other current liabilities	0
Total current liabilities	(261)	(252)
Long-term debt	0	0
Noncurrent operating lease liabilities	0
Noncurrent finance lease liabilities	0	0
Other long-term liabilities	0	0
Deferred revenue	0	0
Class B unit	0	0
Equity - partners	(2,081,311)	(2,114,794)
Equity - noncontrolling interest	0	0
Total liabilities and equity	$ (2,081,572)	$ (2,115,046)