Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes
Goodwill and intangible asset impairment			$ 376,574,000
Impairment of goodwill and intangible assets that yielded permanent tax differences			255,000,000
Reduction in provision for income taxes as a result of goodwill impairment			50,200,000
Valuation Allowance	1,369,000	2,817,000
Unremitted earnings of foreign subsidiaries	15,100,000	4,300,000
Net increase in unrecognized tax benefit	2,200,000	1,400,000
Related interest net of federal tax liability included in tax liabilities	800,000	500,000
Unrecognized Tax Benefits	7,636,000	5,459,000	4,023,000	2,043,000
Interest expense related to unrecognized tax benefit	$ 400,000