Fair Value Measurements and Interest Rate Derivative Agreements (Details) $ in Thousands	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($) item
Assets:
Interest rate derivative agreements	$ 760
Liabilities:
Number of installments to be paid out under the Retirement Benefit Agreement | item	10	10
Amount paid under the Retirement Benefit Agreement	$ 1,000
Level 2
Assets:
Life insurance policy	964	$ 1,198
Total assets	1,724	1,198
Liabilities:
Retirement benefit agreement	964	1,198
Total liabilities	1,401
Level 2 | Interest Rate Cap Agreement
Assets:
Interest rate derivative agreements	1
Level 2 | Interest Rate Swap Agreement
Assets:
Interest rate derivative agreements	759
Liabilities:
Interest rate derivative liabilities	437
Total at the end of the period
Assets:
Life insurance policy	964	1,198
Total assets	1,724	1,198
Liabilities:
Retirement benefit agreement	964	$ 1,198
Total liabilities	1,401
Total at the end of the period | Interest Rate Cap Agreement
Assets:
Interest rate derivative agreements	1
Total at the end of the period | Interest Rate Swap Agreement
Assets:
Interest rate derivative agreements	759
Liabilities:
Interest rate derivative liabilities	$ 437