Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets:
Available-for-sale securities		$ 20,512
Liabilities:
Interest rate swaps	$ 962	2,226
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available-for-sale securities		20,512
Liabilities:
Interest rate swaps	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Available-for-sale securities		0
Liabilities:
Interest rate swaps	962	2,226
Significant Unobservable Inputs (Level 3)
Assets:
Available-for-sale securities		0
Liabilities:
Interest rate swaps	$ 0	$ 0