Significant Accounting Policies Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income, net of tax	$ 1,284	$ 1,797	$ 0
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income, net of tax	$ 1,284	$ 1,797	$ 0