Interest Rate Swap Agreement (Details) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of swaps	$ 12,000	$ 12,000
Net payment rate on swaps	3.00%	3.00%
Interest rate swap settlements reclassified to interest expense	91	181
Interest rate swap gain (loss) capitalized	493	621
Interest rate swap settlements to be reclassified during the next 12 months	354	354
Potential payment to counterparty	$ 2,097	$ 2,097