Retirement and Benefit Plans (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 Integer5	Mar. 31, 2014
Net periodic benefit cost [Abstract]
Net periodic benefit cost	$ 2,082,000	$ 278,000
Pension contributions [Abstract]
Fair Value of Pension Contribution of Real Property	3,000,000
Contributed Properties Leaseback Transaction Lease Term	10 years
Number of Extension Options for Contributed Properties	2
Extension Terms of Contributed Properties	5 years
Rent payments for contributed properties	200,000
Annual rent escalation rate for contributed properties	2.00%
Pension contributions	12,919,000	390,000
Estimated remaining 2015 contributions	1,500,000
Pension Plan [Member]
Net periodic benefit cost [Abstract]
Service cost	475,000	401,000
Interest cost	4,707,000	5,151,000
Expected return on plan assets	(5,200,000)	(5,268,000)
Amortization of actuarial (gain) loss	1,599,000	(6,000)
Plan settlement loss	501,000	0
Net periodic benefit cost	$ 2,082,000	$ 278,000