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Equity - Treasury Stock Activity (Details) - USD ($) shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Equity, Class of Treasury Stock [Line Items]
Value of shares withheld for taxes	$ 2,093
Retirement of treasury stock	$ 0
Treasury Stock
Equity, Class of Treasury Stock [Line Items]
Number of shares withheld for taxes	1,279	637
Value of shares withheld for taxes	$ 2,093	$ 3,865
Retirement of treasury stock (in shares)	1,279	637
Retirement of treasury stock	$ 2,093	$ 3,865

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Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.

+ References

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Number of shares that have been repurchased during the period and are being held in treasury.

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