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Schedule II Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Affiliate Receivables [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 5,246 $ 4,037 $ 2,666
Charged to Costs and Expenses 1,446 [1] 1,209 [1] 1,371 [1]
Balance at End of Period 6,692 5,246 4,037
Deferred Tax Valuation Allowance [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 7,108 10,887 11,229
Charged to Costs and Expenses 120 [1] (3,779) [1] (375) [1]
Charged to Other Accounts    [1]   33 [1]
Balance at End of Period $ 7,228 $ 7,108 $ 10,887
[1] Changes in the deferred tax valuation allowance which have been charged to other accounts have been recorded in accumulated other comprehensive loss.