Summary of Significant Accounting Policies (Additional Information 2) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) segment entity	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Apr. 05, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Aggregate allowance for doubtful accounts	$ 11,500	$ 4,200
Capital lease obligations	7,800	18,100
Lease financing obligations	900	20,600
Net book value of assets associated with leases	$ 14,700	41,500
Number of operating segments | segment	1
Number of reportable segments | segment	1
Valuation allowance	$ 713	393	$ 393
Financial assets	0
Financial liability	0
Net operating loss carry forwards related to Federal income taxes	33,900
Net operating loss carry forwards related to State income taxes	35,800
Unrecognized Tax Benefits	0	0	0
Interest and penalties related to income taxes	$ 0	$ 0	$ 0
Number of subsidiaries taxed as taxable REIT | entity	2
Effective tax rate	65.10%	46.50%	34.80%
Alternative minimum tax	$ 300
One-time non-cash income tax benefit of $3.4 million to reflect the re-measurement of deferred tax assets (liabilities)	3,300
Debt Instrument Face Amount	19,900
Term Loan Maturing 2022
Summary Of Significant Accounting Policies [Line Items]
Debt Instrument Face Amount	300,000
Term Loan Maturing 2025
Summary Of Significant Accounting Policies [Line Items]
Debt Instrument Face Amount	$ 400,000
Interest Rate Swap
Summary Of Significant Accounting Policies [Line Items]
Derivative instruments, notional amount				$ 400,000
Interest Rate Swap | Term Loan
Summary Of Significant Accounting Policies [Line Items]
Debt Instrument Face Amount				400,000
Interest Rate Swap | Term Loan Maturing December 17,2021
Summary Of Significant Accounting Policies [Line Items]
Derivative instruments, notional amount				200,000
Interest Rate Swap | Term Loan Maturing April 27, 2022
Summary Of Significant Accounting Policies [Line Items]
Derivative instruments, notional amount				$ 200,000
Minimum | Federal [Member]
Summary Of Significant Accounting Policies [Line Items]
Net operating loss carry forwards, expiration period	12 years
Minimum | State [Member]
Summary Of Significant Accounting Policies [Line Items]
Net operating loss carry forwards, expiration period	2 years
Maximum | Federal [Member]
Summary Of Significant Accounting Policies [Line Items]
Net operating loss carry forwards, expiration period	20 years
Maximum | State [Member]
Summary Of Significant Accounting Policies [Line Items]
Net operating loss carry forwards, expiration period	20 years
Customer One | Rental Revenue | Maximum
Summary Of Significant Accounting Policies [Line Items]
Percentage of total revenue	11.80%
Other Customers [Member] | Rental Revenue | Maximum
Summary Of Significant Accounting Policies [Line Items]
Percentage of total revenue	4.50%
Five Customers | Accounts Receivable | Minimum
Summary Of Significant Accounting Policies [Line Items]
Percentage of total accounts receivable	5.00%
Five Customers | Accounts Receivable | Maximum
Summary Of Significant Accounting Policies [Line Items]
Percentage of total accounts receivable	33.00%
Customer None | Accounts Receivable | Minimum
Summary Of Significant Accounting Policies [Line Items]
Percentage of total accounts receivable	10.00%