Fair Value of Financial Instruments (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Total	$ 533,859,000	$ 492,557,000
Long-term Debt, Fair Value	535,000,000	497,800,000
Impairment of Long-Lived Assets to be Disposed of	(1,000,000)
Property, Plant and Equipment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Held-for-sale, Long Lived, Total	1,600,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Held-for-sale, Long Lived, Total	$ 600,000