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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 257,290 $ 235,983 $ 226,524
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 22,033 20,066 19,117
Share-based compensation 13,293 12,319 12,596
Deferred income tax (benefit) provision (10,735) 2,720 4,687
Provision for doubtful accounts 1,991 3,487 2,688
Non-cash contribution to 401(k) plan 2,428 2,348 1,963
Other income from investment in unconsolidated entity (3,886)    
Loss (gain) on sale of property and equipment 115 (189) (487)
Excess tax benefits from share-based compensation     (2,422)
Changes in operating assets and liabilities:      
Accounts receivable (1,676) (26,941) (26,121)
Inventories (73,403) (9,729) (3,652)
Accounts payable and other liabilities 99,956 43,734 (11,760)
Other, net (886) (2,067) (285)
Net cash provided by operating activities 306,520 281,731 222,848
Cash flows from investing activities:      
Investment in unconsolidated entity (63,600)    
Capital expenditures (17,876) (43,577) (23,698)
Proceeds from sale of property and equipment 168 744 760
Net cash used in investing activities (81,308) (42,833) (22,938)
Cash flows from financing activities:      
Net repayments under revolving credit agreement (213,494) (10,006) (56,256)
Dividends on Common and Class B common stock (164,147) (127,604) (98,532)
Purchase of additional ownership from non-controlling interest (42,688) (42,909)  
Distributions to non-controlling interest (42,831) (38,900) (39,754)
Repurchases of common stock to satisfy employee withholding tax obligations (4,674) (3,975) (1,465)
Net repayments of other long-term obligations (19) (150) (157)
Excess tax benefits from share-based compensation     2,422
Net proceeds from issuances of common stock 5,244 5,653 5,957
Proceeds from non-controlling interest for investment in unconsolidated entity 12,720    
Net proceeds from the sale of Common stock 247,744    
Net cash used in financing activities (202,145) (217,891) (187,785)
Effect of foreign exchange rate changes on cash and cash equivalents 1,419 (226) (1,343)
Net increase in cash and cash equivalents 24,486 20,781 10,782
Cash and cash equivalents at beginning of year 56,010 35,229 24,447
Cash and cash equivalents at end of year $ 80,496 $ 56,010 $ 35,229