Income Tax (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income Tax [Abstract]
Income tax expense (benefit)	$ 1,847,000	$ (56,489,000)	$ 3,314,000	$ (56,454,000)
Reversal of valuation allowance on net deferred tax assets		57,600,000
Gross unrecognized tax benefits	1,100,000		1,100,000		1,700,000
Disproportionate tax effects		1,400,000
Valuation Allowance [Line Items]
Valuation allowance	1,000,000		1,000,000		1,100,000
Income tax expense reduced	700,000		700,000
Mepco [Member]
Valuation Allowance [Line Items]
Valuation allowance against deferred tax assets attributable to Mepco	$ 1,000,000		$ 1,000,000