CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net income	$ 41,252	$ 41,777
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	57,061	55,572
Equity-based compensation	4,753	6,123
Deferred income taxes	10,935	9,197
Gain on disposal of property, plant and equipment	(1,383)	(739)
Changes in certain assets and liabilities:
Accounts receivable	(110,938)	(60,820)
Inventories	32,348	(55,090)
Other assets	3,358	2,963
Accounts payable	38,988	34,902
Income taxes receivable/payable	(3,022)	17,392
Accrued expenses and liabilities	(43,642)	(29,856)
Net cash provided by operating activities	29,710	21,421
Investing activities:
Purchases of property, plant and equipment	(45,346)	(45,555)
Other investing activities	33,934	(1,864)
Net cash used in investing activities	(11,412)	(47,419)
Financing activities:
Issuance of current and long-term debt	409,261	289,969
Repayment of current and long-term debt	(305,691)	(283,448)
Debt issuance costs	(5,997)	(2,191)
Proceeds from exercise of stock options, including related tax effect	7,614	1,097
Contributions from noncontrolling investors, net	411	9,506
Dividends paid	(21,952)	(21,887)
Net cash provided by (used in) financing activities	83,646	(6,954)
Increase (decrease) in cash and equivalents	101,944	(32,952)
Cash and equivalents at beginning of period	375,917	390,761
Cash and equivalents at end of period	477,861	357,809
Supplemental disclosure information:
Cash paid for interest	49,732	18,753
Cash paid (received) for federal and state income taxes, net	$ 11,165	$ (955)