Summary of Significant Accounting Policies (Additional Information 2) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) segment	Sep. 30, 2015	Dec. 31, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Capital lease obligations	$ 20,600		$ 26,900
Lease financing obligations	21,200		22,800
Net book value of assets associated with leases	$ 42,800		51,000
Number of operating segments | segment	1
Number of reportable segments | segment	1
Financial assets	$ 0		0
Financial liability	$ 0		0
Effective tax rate	48.90%	28.40%
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate allowance for doubtful accounts	$ 3,700		$ 5,100
Customer One [Member] | Rental Revenue [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of total revenue	12.80%
Two Customers [Member] | Accounts Receivable [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of total accounts receivable	10.00%
Other Customers [Member] | Rental Revenue [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of total revenue	4.00%
Six Customers [Member] | Accounts Receivable [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of total accounts receivable	5.00%
Six Customers [Member] | Accounts Receivable [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of total accounts receivable	41.00%
Carpathia Hosting, Inc. [Member]
Summary Of Significant Accounting Policies [Line Items]
Lease financing obligations	$ 21,200