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Recent Accounting Pronouncements Recent Accounting Pronouncements Table (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent $ 6,370 $ 1,813 $ 6,370
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 37,154 31,464  
Income Tax Expense (Benefit) 7,956 10,942  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 29,198 $ 20,522  
Weighted Average Number of Shares Outstanding, Diluted 57,326 58,203  
Weighted Average Number of Shares Outstanding, Basic 54,728 55,828  
Weighted Average Number Diluted Shares Outstanding Adjustment 2,598 2,375  
Comprehensive income attributable to noncontrolling interests $ 525 $ 364  
Net Income (Loss) Attributable to Parent $ 28,673 $ 20,158  
Earnings Per Share, Basic $ 0.52 $ 0.36