Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Restricted shares, performance-based restricted share units and performance share unit activity

The following table presents activity for non-vested restricted shares, performance-based RSUs and performance share units under the Plan in 2014.

	Number of Awards		Weighted-Average Grant Date Fair Value
Balance at January 1, 2014	847,674		$	29.61
Awards granted	261,273		41.01
Awards vested	(156,332	)	28.42
Awards forfeited, canceled or expired	(91,002	)	32.09
Performance-based adjustment	52,568		28.50
Balance at December 31, 2014	914,181		$	32.76