CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) (Accumulated Other Comprehensive Income (Loss), USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss)
Change in fair value of derivative instruments, tax benefit	$ 21	$ 12,682	$ 38,527
Amounts reclassified to statement of operations related to hedging activities, tax	37,017	16,239	23,156
Pension liability adjustment, tax benefit	$ 29,474	$ 4,493	$ 10,694