Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Sep. 30, 2014	Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), beginning balance	$ (49,638)
Amounts reclassified from accumulated other comprehensive income (loss)	(1,274)		(333)
Accumulated other comprehensive income (loss), ending balance	(48,364)
Amortization of Pension and Postretirement Plan items
Tax expense	(386)		(904)
Total reclassified for the period	(588)		(3,573)
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(49,638)		(18,712)
Amounts reclassified from accumulated other comprehensive income (loss)	1,274		333
Accumulated other comprehensive income (loss), ending balance	(48,364)		(18,379)
Amortization of Pension and Postretirement Plan items
Total reclassified for the period	806		473
Reclassification out of Accumulated Other Comprehensive Income [Member]
Amortization of Pension and Postretirement Plan items
Prior Service Costs	2		2
Actuarial (losses)	412		127
Foreign currency translation related to pension and postretirement plans	1,206		293
Total before tax	1,620		422
Tax expense	(346)		(89)
Total reclassified for the period	1,274		333
Pension Plan [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(40,160)		(20,429)
Amounts reclassified from accumulated other comprehensive income (loss)	951		(4)
Accumulated other comprehensive income (loss), ending balance	(39,209)		(20,433)
Pension Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Amortization of Pension and Postretirement Plan items
Prior Service Costs	11		11
Actuarial (losses)		311	50
Foreign currency translation related to pension and postretirement plans		885	24
Total before tax		1,207	85
Tax expense		(256)	(89)
Total reclassified for the period	951		(4)
Post Retirement Plan [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(9,478)		1,717
Amounts reclassified from accumulated other comprehensive income (loss)	323		337
Accumulated other comprehensive income (loss), ending balance	(9,155)		2,054
Post Retirement Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Amortization of Pension and Postretirement Plan items
Prior Service Costs	(9)		(9)
Actuarial (losses)	101		77
Foreign currency translation related to pension and postretirement plans	321		269
Total before tax	413		337
Tax expense	(90)		0
Total reclassified for the period	$ 323		$ 337