Disclosure About Fair Value of Financial Instruments - Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Unrealized gains (in AOCL)			$ 194	$ 270
Tax Increment Financing Bond [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 12,640	$ 13,568	12,447	13,403	$ 13,403
Unrealized gains (in AOCL)	1	105	194	270
Ending balance	$ 12,641	$ 13,673	$ 12,641	$ 13,673	$ 12,447
Maturity date			Dec. 20, 2020
Amount by which outstanding principal amount exceeds estimated fair value			$ 200
Change in discount rate (in hundredths)	1.00%
Discount rate (in hundredths)			8.10%		8.40%
Tax Increment Financing Bond [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in fair value of bond if discount rate changes	$ 300		$ 300
Tax Increment Financing Bond [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in fair value of bond if discount rate changes	$ 400		$ 400