Leasing Arrangements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Capital Leases
2017	$ 1,732
2018	1,591
2019	1,952
2020	1,105
2021	1,084
Subsequent to 2021	1,806
Total minimum lease payments	9,270
Amounts representing interest	604
Present value of net minimum lease payments	8,666
Current maturities	1,542
Long-term capital lease obligation	7,124
Operating Leases
2017	28,930
2018	23,213
2019	17,949
2020	15,250
2021	10,372
Subsequent to 2021	26,275
Total minimum lease payments	121,989
Rental expense for all operating leases	33,300	$ 35,800	$ 39,800
Rental income on subleases of equipment	700	800	700
Assets recorded under capital leases
Plant and equipment	4,807	4,807
Less accumulated depreciation	3,129	2,529
Assets recorded under capital leases	$ 1,678	$ 2,278
Contract Termination | KC
Restructuring Cost and Reserve [Line Items]
Early lease termination penalties			$ 1,200