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, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables (including $28,000 from a related party at December 31, 2013) $ 228,372 $ 150,436
Trade Accounts Receivable [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables (including $28,000 from a related party at December 31, 2013) 225,689 148,902
Employee Receivable [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables (including $28,000 from a related party at December 31, 2013) 1,037 703
Other Receivable [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables (including $28,000 from a related party at December 31, 2013) $ 1,646 $ 831