Leasing Arrangements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Future minimum capital lease payments
2016	$ 1,732,000
2017	1,732,000
2018	2,022,000
2019	1,521,000
2020	1,105,000
Subsequent to 2020	2,890,000
Total minimum lease payments	11,002,000
Amounts representing interest	832,000
Present value of net minimum lease payments	10,170,000
Current maturities	1,504,000
Long-term capital lease obligation	8,666,000
Future minimum operating lease payments
2016	31,671,000
2017	25,513,000
2018	20,600,000
2019	15,888,000
2020	13,436,000
Subsequent to 2020	34,988,000
Total minimum lease payments	142,096,000
Rental expense for all operating leases
Rental expense for all operating leases	35,800,000	$ 39,800,000	$ 45,000,000
Rental income on subleases of equipment	800,000	700,000	600,000
Assets recorded under capital leases
Plant and equipment	4,807,000	4,807,000
Less accumulated depreciation	2,529,000	1,927,000
Assets recorded under capital leases	2,278,000	2,880,000
Capital lease obligations with lease agreements to acquire plant and equipment	$ 0	0	$ 2,200,000
Contract Termination | KC
Restructuring Cost and Reserve [Line Items]
Early lease termination penalties		$ 1,200,000