Income Taxes Reconciliation of the change in unrecognized tax benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of the change in unrecognized tax benefits [Roll Forward]
Unrecognized Tax Benefits, beginning of period	$ 170,425	$ 171,863	$ 258,016
Increases related to tax positions taken during a prior period	12,877	8,782	2,699
Decreases related to tax positions taken during a prior period	(7,502)	(9,373)	(79,719)
Increases related to tax positions taken during the current period	381	11,797	1,620
Decreases related to settlements with taxing authorities	(1,434)	0	0
Reductions as a result of a lapse of the statute of limitations	(1,437)	(12,644)	(10,753)
Unrecognized Tax Benefits, end of period	$ 173,310	$ 170,425	$ 171,863