Goodwill and Intangible Assets (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$ 5.3	$ 4.8	$ 2.8
Expected future annual amortization expense, 2014	4.7
Expected future annual amortization expense, 2015	3.8
Expected future annual amortization expense, 2016	3.1
Expected future annual amortization expense, 2017	2.5
Expected future annual amortization expense, 2018	$ 1.9