Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - Recurring Measurements - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	$ 5,000	$ 10,000
Level 1
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	5,000	10,000
Level 2
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	0	0
Level 3
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	0	0
Interest rate swaps
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	(299)	(471)
Interest rate swaps | Level 1
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	0	0
Interest rate swaps | Level 2
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	(299)	(471)
Interest rate swaps | Level 3
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	$ 0	$ 0