Annual report pursuant to Section 13 and 15(d)

Receivables and Allowance for Doubtful Receivables (Receivables by Type) (Details)

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Receivables and Allowance for Doubtful Receivables (Receivables by Type) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables $ 208,384 $ 212,441
Trade Accounts Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables 205,645 209,811
Employee Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables 1,271 801
Other Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables $ 1,468 $ 1,829