Share-Based Compensation Arrangements (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified		3 Months Ended		6 Months Ended			12 Months Ended		3 Months Ended		6 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Stock Appreciation Rights And Phantom Shares [Member]	Jun. 30, 2013 Stock Appreciation Rights And Phantom Shares [Member]	Jun. 30, 2014 Stock Appreciation Rights And Phantom Shares [Member]	Jun. 30, 2013 Stock Appreciation Rights And Phantom Shares [Member]	Jun. 30, 2014 Phantom Share Units (PSUs) [Member]	Dec. 31, 2013 Phantom Share Units (PSUs) [Member]	Dec. 31, 2012 Phantom Share Units (PSUs) [Member]	Jun. 30, 2014 DSUs [Member]	Jun. 30, 2013 DSUs [Member]	Jun. 30, 2014 DSUs [Member]	Jun. 30, 2013 DSUs [Member]	Dec. 31, 2013 DSUs [Member]	Jun. 30, 2014 Restricted Stock Units (RSUs) [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	$ 5.09														$ 9.05
Share based compensation expense		$ 0.3	$ 1.0	$ 0.6	$ 2.4				$ (0.1)	$ 0.6	$ (0.2)	$ 1.0
Share based compensation, unrecognized liability						0.1	1.7
Cash paid under SAR and DSU plan				1.0	1.6						0.7	0.2
Percentage of RSUs settled in shares														75.00%
Percent settled in cash														25.00%
Liability for DSU deferred compensation									$ 0.3		$ 0.3		$ 1.2