Employee Benefit Plans (Net periodic benefit costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 313	$ 317
Interest cost	5,384	5,638
Recognized actuarial loss	239	(70)
Expected return on plan assets	(5,556)	(5,446)
Net periodic benefit cost	$ 380	$ 439