Income Taxes (Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes
Balance at January 1	$ 38,886	$ 79,012	$ 87,975
Additions based on tax positions related to the current year	1,037	1,801	10,101
Additions for tax positions of prior years	0	16,520	11,109
Reductions for tax positions of prior years	(221)	(54,430)	(30,855)
Foreign currency	(439)	(3,550)	735
Reduction as a result of the lapse of statute limitations and effective settlements	(4,926)	(467)	(53)
Balance at December 31,	$ 34,337	$ 38,886	$ 79,012