Balance Sheet Account Detail - Prepaid Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prepaid operating expenses	$ 2,352	$ 3,507
Current portion of debt issuance costs	0	0
Prepaid expenses and other assets	2,352	3,507
Long-term Debt [Member] | Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs	2,000	2,200
Other Assets [Member] | Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs	$ (2,000)	$ (2,200)