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DEBT AND FINANCING ARRANGEMENTS - Debt terms (Details) - USD ($) $ in Thousands	Dec. 10, 2019	Jun. 19, 2019	Dec. 06, 2017	Mar. 13, 2014	Mar. 23, 2010
Senior Notes | 5.875% Senior Notes
Debt Instrument [Line Items]
Aggregate Principal					$ 500,000
Issue Price					99.624%
Net Proceeds					$ 495,000
Interest rate					5.875%
Senior Notes | 5.150% Senior Notes
Debt Instrument [Line Items]
Aggregate Principal				$ 250,000
Issue Price				99.474%
Net Proceeds				$ 246,000
Interest rate				5.15%
Senior Notes | 4.000% Senior Notes
Debt Instrument [Line Items]
Aggregate Principal			$ 350,000
Issue Price			99.78%
Net Proceeds			$ 347,000
Interest rate			4.00%
Senior Notes | 3.900% Senior Notes
Debt Instrument [Line Items]
Aggregate Principal		$ 300,000
Issue Price		99.36%
Net Proceeds		$ 296,000
Interest rate		3.90%
Junior Subordinated Notes
Debt Instrument [Line Items]
Aggregate Principal	$ 425,000
Issue Price	99.00%
Net Proceeds	$ 420,750
Interest rate	4.90%
Junior Subordinated Notes | Five-Year Treasury Rate
Debt Instrument [Line Items]
Basis spread on variable rate	3.186%

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-Publisher FASB
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-Topic 835
-SubTopic 30
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