Long-Lived Assets (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Long-Lived Assets (Textual) [Abstract]
Total amortization expense	$ 9,100,000	$ 11,500,000	$ 26,600,000	$ 31,200,000
Estimated total amortization expense 2013	35,000,000		35,000,000
Estimated total amortization expense 2014	28,600,000		28,600,000
Estimated total amortization expense 2015	17,700,000		17,700,000
Estimated total amortization expense 2016	13,200,000		13,200,000
Estimated total amortization expense 2017	10,600,000		10,600,000
Write-down of goodwill			1,417,000
Proceeds from disposition of business			$ 1,734,000