Financial Instruments - Narrative (Details) (Interest rate swaps, USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Interest rate swaps
Financial Instruments (Textual) [Abstract]
Notional Amount	$ 75,000	$ 75,000	$ 0
Fixed LIBOR interest rate		1.08%
Derivative instrument, amortized into earnings from accumulated other comprehensive loss (less than)	$ 100