Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Internal-Use Software
Capitalized Computer Software Impairment		$ 1,037		$ 1,959
Revenue Recognition
Increase to rental revenue	$ 100	$ 100	$ 300	$ 200
Allowance for doubtful accounts (in dollars)	132		132		$ 112
Asset Retirement and Environmental Remediation Obligations
Asset retirement and environmental remediation obligations	2,300		$ 2,300		$ 2,300
Income taxes
Minimum percentage of distribution of taxable income to qualify as REIT			90.00%
Percentage of distribution of taxable income as per company policy			100.00%
Provision for federal income taxes			$ 0
Liabilities for uncertain positions	$ 0		$ 0