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Joint Venture - Operating Results (Details) (Joint venture, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Joint venture
     
Schedule of Equity Method Investments [Line Items]      
Revenues $ 230,351 $ 257,776 $ 269,657
Net income 13,720 14,603 23,643
Current assets 82,827 92,421 111,263
Non-current assets 25,615 26,099 22,979
Current liabilities 10,548 14,315 59,952
Non-current liabilities 16,103 27,845 3,089
Members’ equity 81,791 76,360 71,199
Capital expenditures 1,855 5,259 6,736
Depreciation and amortization $ 2,217 $ 2,034 $ 1,603