Subsequent Events (Details Textual) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Subsequent Event [Line Items]
Long-term Line of Credit	$ 43,364,000	$ 9,500,000
Line of Credit Facility, Interest Rate Description	interest at LIBOR plus a spread of 150 to 215 basis points, or the base rate, depending on the Companys leverage ratio
Line of Credit Facility, Current Borrowing Capacity	85,000,000
Line of Credit Facility, Maximum Borrowing Capacity	135,000,000
Payments to Acquire Property, Plant, and Equipment	34,500,000
Line of Credit Facility, Expiration Date	Oct. 26, 2015
Subsequent Event [Member]
Subsequent Event [Line Items]
Long-term Line of Credit	250,000,000
Payments to Acquire Property, Plant, and Equipment	25,000,000
Unsecured Term Loan Two [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Long-term Line of Credit	65,000,000
Line of Credit Facility, Interest Rate Description	LIBOR plus 165 to 225 basis points
Line of Credit Facility, Maximum Borrowing Capacity	75,000,000
Line of Credit Facility, Interest Rate at Period End	3.74%
Line of Credit Facility, Expiration Period	7 years
Line of Credit Facility, Expiration Date	Jul. 21, 2021
Unsecured Term Loan Two [Member] | Interest Rate Swap [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Interest Rate Description	LIBOR at 2.09%
Unsecured Term Loan One [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Long-term Line of Credit	35,000,000
Revolving Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Long-term Line of Credit	150,000,000
Line of Credit Facility, Interest Rate Description	LIBOR plus 135 to 200 basis points
Line of Credit Facility, Current Borrowing Capacity	85,000,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 250,000,000
Line of Credit Facility, Expiration Date	Jul. 21, 2018