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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Trade accounts receivable, allowance $ 864 $ 1,190
Other, accumulated amortization of debt issuance costs 12,057 10,186
Intangible assets, accumulated amortization 52,174 44,856
Deferred revenues, related party amounts 28 41
Series A Preferred Units, redemption amount $ 84,889 $ 84,773