15. Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Cash Flow Hedge Derivative Notional Amount	$ 110,000	$ 70,000
Cash Flow Hedge Derivative Assets Fair Value	0	803
Cash Flow Hedge Derivative Liability Fair Value	1,582	0
Cash Flow Hedge Derivative Net ineffective hedge gain losses	0	0
Long-term Debt [Member]
Cash Flow Hedge Derivative Notional Amount	110,000	70,000
Cash Flow Hedge Derivative Assets Fair Value	0	803
Cash Flow Hedge Derivative Liability Fair Value	1,582	0
Cash Flow Hedge Derivative Net ineffective hedge gain losses	$ 0	$ 0