Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						12 Months Ended			15 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Sep. 30, 2012
Sources of income (loss) before income taxes
Domestic							$ 34,633	$ 12,674	$ (55,547)
Foreign							52,050	22,028	45,651
Income (loss) before income taxes							86,683	34,702	(9,896)
Current:
Federal							873	6,594	(3,489)
State and local							192	493	665
Foreign							19,106	11,180	7,559
Deferred:
Federal							3,822	(4,893)	21,665
Foreign							(136)	(3,238)	542
Income tax expense	$ 10,191	$ 6,037	$ 4,184	$ 3,445	$ 1,085	$ 147	$ 23,857	$ 10,136	$ 26,942	$ 5,420	$ 3,484