Retirement Plans Employee Retirement Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	4.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	50% of the first 4%
Defined Contribution Plan, Cost Recognized	$ 1,089,000	$ 1,029,000	$ 1,070,000