Income Taxes (Unrecognized Tax Benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Balance at beginning of period	$ 19,494	$ 14,953
Additions based on tax positions related to the current year	3,150	6,300
Additions for tax positions of prior years	1,764	1,908
Reductions as a result of settlement with taxing authorities	(285)
Reductions as a result of the lapse of the applicable statute of limitations	(2,256)	(3,667)
Reduction for tax positions of prior years	(947)
Balance at end of period	$ 20,920	$ 19,494