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Stock-Based Compensation (Detail) - (Table 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Total	$ 4,527	$ 4,817	$ 13,609	$ 14,593
Restricted Stock [Member]
Allocated Share-based Compensation Expense	3,792	3,787	11,120	11,300
Stock Options [Member]
Allocated Share-based Compensation Expense	$ 735	$ 1,030	$ 2,489	$ 3,293

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



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