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Recent Accounting Pronouncements Recent Accounting Pronouncements Table (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent $ 1,813 $ 594 $ 1,813 $ 594 $ 1,813
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 66,007 64,513 140,074 130,653  
Income Tax Expense (Benefit) 21,181 20,810 45,703 38,212  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 44,826 $ 43,703 $ 94,371 $ 92,441  
Weighted Average Number of Shares Outstanding, Diluted 57,751 59,329 57,894 59,772  
Weighted Average Number of Shares Outstanding, Basic 54,904 56,869 55,290 57,334  
Weighted Average Number Diluted Shares Outstanding Adjustment 2,847 2,460 2,604 2,438  
Comprehensive income attributable to noncontrolling interests $ 596 $ (64) $ 1,019 $ 278  
Net Income (Loss) Attributable to Parent $ 44,230 $ 43,767 $ 93,352 $ 92,163  
Earnings Per Share, Basic $ 0.81 $ 0.77 $ 1.69 $ 1.61  
Adjustments for New Accounting Pronouncement [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent $ 14,573   $ 14,573   $ 13,985