Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Net operating loss carryforward	$ 288,300,000
Valuation allowance increase	2,500,000
Net deferred tax asset	258,142,000	243,554,000
Current taxes payable	24,700,000	30,100,000
Unrecognized tax benefits	5,510,000	5,158,000	1,750,000	3,091,000
Unrecognized tax benefits, accrued interest and penalties	$ 1,200,000	$ 1,000,000