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INCOME TAXES AND RELATED PAYMENTS - Income Tax Effects of Temporary Differences (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Investment in partnerships $ 277,039 $ 157,999 $ 67,918
Equity-based compensation expense 3,695 3,994 3,703
Other, net 1,822 1,697 1,365
Total deferred tax assets 282,556 163,690 72,986
Total deferred tax liabilities 3,671 4,519 4,548
Net deferred tax assets before valuation allowance 278,885 159,171 68,438
Valuation allowance 0 0 0
Net deferred tax assets $ 278,885 $ 159,171 $ 68,438