Spin Off of Knowles Corporation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 28, 2014
Total assets of discontinued operations	$ 327,171	$ 2,779,063
Current liabilities	38,874	432,395
Total liabilities of discontinued operations	50,718	535,621
Transfer of cash and cash equivalents at spin off, gross	400,000
Cash received from Knowles Corporation, net of cash distributed	359,955	0	0
Stockholders' Equity Note, Spinoff Transaction	1,423,197
Goodwill reallocation due to Knowles separation	19,749
Knowles [Member]
Revolving credit facility				100,000
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
Term loan facility				300,000
Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity Note, Spinoff Transaction	$ 26,695