Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating Loss Carryforwards [Line Items]
Effective income tax rates	(11.50%)	(50.30%)	(22.10%)	20.90%
Income tax expense	$ 2,082,000	$ 8,345,000	$ 3,597,000	$ 14,261,000
Unrecognized tax benefits	1,200,000		1,200,000
United States Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net deferred tax assets	$ 0		$ 0