Defined Benefit Pension Plans Defined Benefit Pension Plan Additional Information (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 57,000	$ 361,000	$ 375,000
Estimated Future Employer Contributions in Current Fiscal Year	$ 393,000