Long-Lived Assets (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Long-Lived Assets (Textual) [Abstract]
Total amortization expense	$ 9.1	$ 9.6
Estimated total amortization expense 2013	31.8
Estimated total amortization expense 2014	24.2
Estimated total amortization expense 2015	16.4
Estimated total amortization expense 2016	12.3
Estimated total amortization expense 2017	$ 9.9