Summary of Significant Accounting Policies (Additional Information 2) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment subsidiary	Jun. 30, 2016 USD ($)	Apr. 05, 2017 USD ($)	Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Capital lease obligations	$ 12,700		$ 12,700			$ 18,100
Lease financing obligations	19,400		19,400			20,600
Net book value of assets associated with leases	35,900		$ 35,900			41,500
Number of operating segments | segment			1
Number of reportable segments | segment			1
Financial assets						0
Financial liability						0
Number of subsidiaries taxed as taxable REIT | subsidiary			2
Effective tax rate			39.10%	38.20%
Decrease in fair value of interest rate swaps	(1,499)		$ (1,499)
Interest Rate Swap
Summary Of Significant Accounting Policies [Line Items]
Derivative instruments, notional amount					$ 400,000
Decrease in fair value of interest rate swaps		$ 0		$ 0
Interest Rate Swap | Term Loan [Member]
Summary Of Significant Accounting Policies [Line Items]
Debt Instrument Face Amount					400,000
Interest Rate Swap | Term Loan Maturing December 17,2021 [Member]
Summary Of Significant Accounting Policies [Line Items]
Derivative instruments, notional amount					200,000
Interest Rate Swap | Term Loan Maturing April 27, 2022 [Member]
Summary Of Significant Accounting Policies [Line Items]
Derivative instruments, notional amount					$ 200,000
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate allowance for doubtful accounts	$ 5,000		$ 5,000			$ 4,200
Customer One [Member] | Rental Revenue [Member] | Maximum
Summary Of Significant Accounting Policies [Line Items]
Percentage of total revenue			12.80%
Other Customers [Member] | Rental Revenue [Member] | Maximum
Summary Of Significant Accounting Policies [Line Items]
Percentage of total revenue			5.00%
Four Customers [Member] | Accounts Receivable [Member] | Minimum
Summary Of Significant Accounting Policies [Line Items]
Percentage of total accounts receivable	10.00%		10.00%
Five Customers [Member] | Accounts Receivable [Member] | Minimum
Summary Of Significant Accounting Policies [Line Items]
Percentage of total accounts receivable	5.00%		5.00%
Five Customers [Member] | Accounts Receivable [Member] | Maximum
Summary Of Significant Accounting Policies [Line Items]
Percentage of total accounts receivable	51.00%		51.00%
Carpathia Hosting, Inc.
Summary Of Significant Accounting Policies [Line Items]
Lease financing obligations	$ 19,400		$ 19,400