Share-Based Compensation Share-Based Compensation (Summary of Quantitative Effects on Consolidated Financial Statements) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision	$ 4,311	$ 5,466
Net income	$ 10,217	$ 11,551
Basic (usd per share)	$ 0.19	$ 0.22
Diluted (usd per share)	$ 0.19	$ 0.22
Diluted weighted average shares (in shares)	53,190,057	53,593,269
Change in income taxes	$ 3,230	$ 5,989
As Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision		6,211
Net income		$ 10,806
Basic (usd per share)		$ 0.20
Diluted (usd per share)		$ 0.20
Diluted weighted average shares (in shares)		53,430,103
Change in income taxes		$ 6,734

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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