Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 02, 2019	Mar. 31, 2019	Mar. 31, 2018
Condensed Consolidating Statements Of Cash Flows
Net cash provided by (used for) operating activities		$ 69,854	$ (81,683)
Cash flows from investing activities:
Purchases of investments		(4,221)	(676)
Sales and maturities of investments		1,134	1,148
Cash paid for acquisitions of businesses, net of cash acquired		(2,929)
Capital expenditures		(141,070)	(94,026)
Proceeds from sales of assets and insurance claims		2,642	3,076
Net cash (used for) provided by investing activities		(144,444)	(90,478)
Cash flows from financing activities:
Debt issuance costs		(35)	(12,928)
Reduction of long-term debt		(43,540)	(460,837)
Dividends to shareholders	$ (3,500)		(17,148)
Proceeds from (payments for) commercial paper, net			(40,000)
Proceeds from revolving credit facilities		180,000	615,000
Reduction in revolving credit facilities		(50,000)	(680,000)
Dividends to common and preferred shareholders		(25,765)	(17,148)
Proceeds from (payments for) short-term borrowings		289	194
Proceeds from issuance of long-term debt			800,000
Other changes		(1,493)	(2,245)
Net cash provided by financing activities		59,456	202,036
Effect of exchange rate changes on cash and cash equivalents		(2,791)	(867)
Net increase (decrease) in cash, cash equivalents and restricted cash		(17,925)	29,008
Cash and cash equivalents and restricted cash, beginning of period		451,080	342,029
Cash and cash equivalents and restricted cash, end of period		433,155	371,037
Consolidating Adjustments
Condensed Consolidating Statements Of Cash Flows
Net cash provided by (used for) operating activities		(58,468)	(24,981)
Cash flows from investing activities:
Cash paid for investments in consolidated affiliates		4,000
Net cash (used for) provided by investing activities		4,000
Cash flows from financing activities:
Dividends to shareholders			2,981
Dividends to common and preferred shareholders		3,168
Proceeds from parent contributions		(4,000)
Distribution from subsidiary to parent		55,300	22,000
Net cash provided by financing activities		54,468	24,981
Parent Company | Reportable Legal Entities
Condensed Consolidating Statements Of Cash Flows
Net cash provided by (used for) operating activities		55,162	22,374
Cash flows from financing activities:
Proceeds from (payments for) issuance of common shares		6
Dividends to shareholders			(20,129)
Proceeds from issuance of intercompany debt		25,000	20,000
Dividends to common and preferred shareholders		(28,557)
Paydown of intercompany debt		(50,500)	(21,000)
Other changes		(1,251)	(1,862)
Net cash provided by financing activities		(55,302)	(22,991)
Net increase (decrease) in cash, cash equivalents and restricted cash		(140)	(617)
Cash and cash equivalents and restricted cash, beginning of period		474	1,091
Cash and cash equivalents and restricted cash, end of period		334	474
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Consolidating Statements Of Cash Flows
Net cash provided by (used for) operating activities		(88,799)	(98,371)
Cash flows from investing activities:
Change in intercompany balances		(1,627)	(122,864)
Net cash (used for) provided by investing activities		(1,627)	(122,864)
Cash flows from financing activities:
Debt issuance costs		(35)	(12,928)
Reduction of long-term debt		(43,540)	(460,837)
Proceeds from (payments for) commercial paper, net			(40,000)
Proceeds from revolving credit facilities		180,000	615,000
Reduction in revolving credit facilities		(50,000)	(680,000)
Proceeds from issuance of long-term debt			800,000
Proceeds from parent contributions		4,000
Net cash provided by financing activities		90,425	221,235
Net increase (decrease) in cash, cash equivalents and restricted cash		(1)
Cash and cash equivalents and restricted cash, beginning of period		42	44
Cash and cash equivalents and restricted cash, end of period		41	44
Other Subsidiaries (Non-Guarantors) | Reportable Legal Entities
Condensed Consolidating Statements Of Cash Flows
Net cash provided by (used for) operating activities		161,959	19,295
Cash flows from investing activities:
Purchases of investments		(4,221)	(676)
Sales and maturities of investments		1,134	1,148
Cash paid for acquisitions of businesses, net of cash acquired		(2,929)
Cash paid for investments in consolidated affiliates		(4,000)
Capital expenditures		(141,070)	(94,026)
Proceeds from sales of assets and insurance claims		2,642	3,076
Change in intercompany balances		1,627	122,864
Net cash (used for) provided by investing activities		(146,817)	32,386
Cash flows from financing activities:
Proceeds from (payments for) issuance of common shares		(6)
Proceeds from issuance of intercompany debt		(25,000)	(20,000)
Dividends to common and preferred shareholders		(376)
Proceeds from (payments for) short-term borrowings		289	194
Paydown of intercompany debt		50,500	21,000
Distribution from subsidiary to parent		(55,300)	(22,000)
Other changes		(242)	(383)
Net cash provided by financing activities		(30,135)	(21,189)
Effect of exchange rate changes on cash and cash equivalents		(2,791)	(867)
Net increase (decrease) in cash, cash equivalents and restricted cash		(17,784)	29,625
Cash and cash equivalents and restricted cash, beginning of period		450,564	340,894
Cash and cash equivalents and restricted cash, end of period		$ 432,780	$ 370,519