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1. Basis of Presentation and Use of Estimates Organization, Consolidation and Presentation of Financial Statements (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Long-term debt, net of current maturities $ 433,980 $ 433,883
Other assets $ 65,640 64,618
Adjustments for New Accounting Pronouncement [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Long-term debt, net of current maturities   1,800
Other assets   $ 1,800