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Recent Accounting Pronouncements Recent Accounting Pronouncements Table (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent $ 1,813,000 $ 594,000 $ 1,813,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options   $ 3,697  
Earnings Per Share, Diluted   $ 0.06  
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest 31,464,000 $ 29,704,000  
Income Tax Expense (Benefit) 10,942,000 5,808,000  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 20,522,000 $ 23,896,000  
Weighted Average Number of Shares Outstanding, Diluted 58,203 60,253  
Weighted Average Number of Shares Outstanding, Basic 55,828 57,709  
Weighted Average Number Diluted Shares Outstanding Adjustment 2,375 2,544  
Comprehensive income attributable to noncontrolling interests $ 364,000 $ 237,000  
Net Income (Loss) Attributable to Parent $ 20,158,000 $ 23,659,000  
Earnings Per Share, Basic $ 0.36 $ 0.41  
Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent   $ 14,342,000 $ 13,985,000