Spin Off of Knowles (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Feb. 28, 2014
Transfer Of Cash And Cash Equivalents At Spin Off Gross			$ 400,000
Cash received from Knowles Corporation, net of cash distributed	0	359,197	359,955
Accumulated other comprehensive income related to foreign currency translation and pension obligations			26,695
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Total assets of discontinued operations	215,429		327,171
Current liabilities	21,616		38,874
Total liabilities of discontinued operations	36,711		50,718
Knowles [Member]
Revolving credit facility				100,000
Term loan facility				300,000
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Cash and cash equivalents				40,045
Other current assets				340,945
Non-current assets				1,678,820
Total assets of discontinued operations				2,059,810
Current liabilities				252,673
Non-current liabilities				383,940
Total liabilities of discontinued operations				636,613
Net assets distributed to Knowles Corporation				$ 1,423,197