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Other Balance Sheet Captions - Deferred Credits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2001
Dec. 31, 2016
Dec. 31, 2015
Supplemental Balance Sheet Disclosures [Abstract]          
USDA grant       $ 1,434 $ 1,949
LCD reimbursement       959 1,042
Other reimbursement       313 411
Deferred incentive       272 0
Total       $ 2,978 $ 3,402
Other Balance Sheet Disclosures [Line Items]          
Proceeds from Grants and reimbursements     $ 26,000    
Reimbursment [Member]          
Other Balance Sheet Disclosures [Line Items]          
Proceeds from Grants and reimbursements   $ 1,250      
Reimbursment Of Maintenance Costs [Member]          
Other Balance Sheet Disclosures [Line Items]          
Proceeds from Grants and reimbursements $ 1,236