CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Interest expense to affiliates	$ 36,836	$ 15,390	$ 71,079	$ 26,884
Change in unrealized gains (losses) on cash flow hedges, tax	1,950	(1,238)	720	(2,944)
Change in unrealized gains on investments available for sale, tax	$ 0	$ 682	$ 0	$ 1,625