Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Income (loss) before provision for income taxes	$ 6,471	$ (2,016)
Income tax expense (benefit) using estimated annual effective income tax rate	2,303	(788)
Impact of discrete items, net	639	453
Income tax expense (benefit)	$ 2,942	$ (335)