Fair Value Measurements - Reconciliation of Recurring Financial Liability Related to Interest Rate Swaps (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Total gains/(losses) for the period:
Amount expected to be reclassed into earning as interest expense	$ 800
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging
Reconciliation of the recurring financial liability related to interest rate swaps
Beginning balance	(1,020)	$ (998)
Total gains/(losses) for the period:
Included in earnings	768	488
Included in other comprehensive earnings	(516)	(510)
Ending balance	$ (768)	$ (1,020)