Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 290,160	$ 136,530	$ 126,454
Other comprehensive income (loss):
Unrealized gain (loss) on interest rate swaps	6,262	5,693	(19,091)
Other comprehensive income (loss), before income taxes	6,262	5,693	(19,091)
Income tax (expense) benefit	(2,311)	(2,112)	7,064
Other comprehensive income (loss), net of income taxes	3,951	3,581	(12,027)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	294,111	140,111	114,427
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest	578	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 294,689	$ 140,111	$ 114,427