Share-Based Compensation Arrangements (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			12 Months Ended		3 Months Ended
	Mar. 31, 2014 Stock Appreciation Rights And Phantom Shares [Member]	Mar. 31, 2013 Stock Appreciation Rights And Phantom Shares [Member]	Mar. 31, 2014 Phantom Share Units (PSUs) [Member]	Dec. 31, 2013 Phantom Share Units (PSUs) [Member]	Dec. 31, 2012 Phantom Share Units (PSUs) [Member]	Mar. 31, 2014 DSUs [Member]	Mar. 31, 2013 DSUs [Member]	Dec. 31, 2013 DSUs [Member]	Mar. 31, 2014 Common Class A [Member]	Dec. 31, 2013 Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage per year			33.33%
Award vesting period			3 years
Performance based phantom shares issued				23,642	435,866
Common stock price									$ 6.90	$ 9.05
Share based compensation expense	$ 0.3	$ 1.4				$ (0.1)	$ 0.4
Share based compensation, unrecognized liability			0.2	1.7
Cash paid under SAR and DSU plan	0.8	1.6				0.7	0.2
Liability for DSU deferred compensation						$ 0.4		$ 1.2