Share-Based Compensation (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Allocated Share-based Compensation Expense			$ 2,723	$ 2,461
Long Term Cash Incentive Plan [Member]
Allocated Share-based Compensation Expense	(2)	(155)	154	70
Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense	$ 1,336	$ 1,111