Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income (loss) before provision for income taxes	$ 31,669	$ (55,860)	$ 57,272	$ (34,348)
Income tax expense using estimated annual effective income tax rate	9,932	(22,763)	17,962	(13,997)
Changes in effective tax rates	(374)	1,181	0	1,159
Increase in unrecognized tax benefits	0	251	0	373
Impact of discrete items, net	1,305	0	1,944	816
Impact of discrete item associated with litigation settlement	0	2,362	0	2,362
Inclusion of tax liabilities from unincorporated entities	1,101	0	1,101	0
Income tax expense (benefit)	$ 11,964	$ (18,969)	$ 21,007	$ (9,287)