Share-Based Compensation (Details Textual)	6 Months Ended
	Jun. 30, 2014
Market Share Units [Member]
Share Based Compensation [Abstract]
Vesting period	3 years
Performance Shares [Member]
Share Based Compensation [Abstract]
Vesting period	3 years
Maximum [Member] | Market Share Units [Member]
Share Based Compensation [Abstract]
Maximum of range for number of shares earned	150.00%
Maximum [Member] | Performance Shares [Member]
Share Based Compensation [Abstract]
Maximum of range for number of shares earned	200.00%
Minimum [Member] | Market Share Units [Member]
Share Based Compensation [Abstract]
Minimum of range for number of shares earned	0.00%
Minimum [Member] | Performance Shares [Member]
Share Based Compensation [Abstract]
Minimum of range for number of shares earned	0.00%