Financial Instruments - Effective Portion of Unrealized Gain and Loss (Details) (Interest rate swaps, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest rate swaps
Derivatives designated as cash flow hedges:
Effective portion recognized in accumulated OCL, gain/(loss)	$ 0	$ 817	$ 0	$ 745
Amounts reclassified from accumulated OCL, gain/(loss)	96	167	192	333
Derivative, Gain (Loss) on Derivative, Net	(111)		(62)
Gain/(loss) on derivative		$ 0		$ 0