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Unaudited Condensed Consolidated Statement of Equity Statement - USD ($)
$ in Thousands
Total
Common Stock
Treasury Stock
Capital in Excess of Par Value
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interest
Stockholders' Equity [Roll Forward]              
Cumulative Effect of New Accounting Principle in Period of Adoption $ 172,232 $ 0 $ 0 $ 0 $ 172,461 $ (229) $ 0
Balance at beginning of period at Dec. 31, 2017 1,409,437 191,936 (5,321) 970,468 210,364 41,943 47
Stockholders' Equity [Roll Forward]              
Comprehensive income 72,456 0 0 0 81,988 (9,589) 57
Balance at end of period at Mar. 31, 2018 1,511,849 192,428 (8,416) 961,744 333,864 32,125 104
Balance at beginning of period at Dec. 31, 2017 1,409,437 191,936 (5,321) 970,468 210,364 41,943 47
Stockholders' Equity [Roll Forward]              
Dividends declared on common stock 31,348 0 0 0 31,348 0 0
Employee share-based compensation earned 3,699 0 0 3,699 0 0 0
Stock option exercises (4,989) (282) 0 (4,707) 0 0 0
Restricted stock awards, net of forfeitures 0 163 0 (163) 0 0 0
Purchase of Company common stock (118,797) 0 (3,095) (16,101) (99,601) 0 0
Other (819) 47 0 (866) 0 0 0
Balance at end of period at Dec. 31, 2018 1,641,815 184,721 (3,250) 972,710 474,327 13,395 (88)
Stockholders' Equity [Roll Forward]              
Comprehensive income 86,614 0 0 0 79,323 7,251 40
Dividends declared on common stock 32,820 0 0 0 32,820 0 0
Employee share-based compensation earned 4,568 0 0 4,568 0 0 0
Stock option exercises (15,962) (950) 0 (15,012) 0 0 0
Restricted stock awards, net of forfeitures 0 126 0 (126) 0 0 0
Purchase of Company common stock (14,542) 0 (355) (1,935) (12,252) 0 0
Other (1,192) 59 0 (1,251) 0 0 0
Balance at end of period at Mar. 31, 2019 $ 1,700,405 $ 185,856 $ (3,605) $ 988,978 $ 508,578 $ 20,646 $ (48)