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Recent Accounting Pronouncements Recent Accounting Pronouncements Table (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | $ 1,813,000 | $ 594,000 |  | $ 1,813,000 | $ 594,000 | $ 1,813,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options |  |  | $ 65 |  | $ 3,762 |
Earnings Per Share, Diluted |  |  | $ 0.01 |  | $ 0.06 |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 42,605,000 | 36,436,000 |  | 74,068,000 | $ 66,140,000 |
Income Tax Expense (Benefit) | 13,582,000 | 11,594,000 |  | 24,523,000 | 17,402,000 |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ 29,023,000 | $ 24,842,000 |  | $ 49,545,000 | $ 48,738,000 |
Weighted Average Number of Shares Outstanding, Diluted | 57,750 | 59,739 |  | 57,969 | 59,998 |
Weighted Average Number of Shares Outstanding, Basic | 55,161 | 57,430 |  | 55,487 | 57,572 |
Weighted Average Number Diluted Shares Outstanding Adjustment | 2,589 | 2,309 |  | 2,482 | 2,426 |
Comprehensive income attributable to noncontrolling interests | $ 59,000 | $ 105,000 |  | $ 423,000 | $ 342,000 |
Net Income (Loss) Attributable to Parent | $ 28,964,000 | $ 24,737,000 |  | $ 49,122,000 | $ 48,396,000 |
Earnings Per Share, Basic | $ 0.53 | $ 0.43 |  | $ 0.89 | $ 0.84 |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent |  |  | $ 14,312,000 |  |  | $ 13,985,000

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