Consolidated Statements of Operations and Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Accumulated other comprehensive income	$ 1,857	$ 3,555	$ 2,578	$ 3,969
Income tax expense from reclassification items	$ 0	$ 0	$ 0	$ 0