Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2014

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

Summary of Restricted Common Stock Grant Awards by Year for Grant Years with Unvested Shares and Remaining Vesting Schedule

The following table summarizes employee restricted common stock grant awards by year for grant years with unvested shares outstanding at December 31, 2014 and the remaining vesting schedule.

	2014	2013	2012	2011
Number of shares of restricted common stock:
Granted during the year	482,001	494,420	155,000	663,530
Unvested at December 31, 2014	341,861	154,040	51,500	144,802
Scheduled to vest during the year ending:
December 31, 2015	156,137	152,040	51,500	79,802
December 31, 2016	157,337	2,000	—	65,000	(1)
December 31, 2017	28,387	—	—	—

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(1) Shares of restricted common stock granted under a performance-based award which will vest on June 30, 2016 if the performance conditions are met.

Share-based Compensation, Performance Shares Award Unvested Activity

The following table summarizes restricted stock units awarded by year for grant years with unvested units outstanding at December 31, 2014.

	2014		2013
Number of shares of restricted stock units:
Granted during the year		395,900		432,300
Unvested at December 31, 2014		382,600		393,900
Vest date	February 1, 2017		February 1, 2016
Performance measurement period:
Fiscal year ended	December 31, 2016		December 31, 2015

Restricted Common Stock Activity in Stock Incentive Plans

The following table summarizes restricted common stock and performance-based restricted stock unit activity in our stock incentive plans for the year ended December 31, 2014.

	Restricted Common Stock						Restricted Stock Units
	Number of Shares		Weighted Average Grant Date Fair Value				Number of Units		Weighted Average Grant Date Fair Value
Unvested at beginning of year	781,644			$	11.46		409,100			$	9.22
Granted	514,507			12.58			395,900			12.14
Vested	(512,042	)		(11.91		)	—			—
Forfeited	(31,408	)		(11.91		)	(28,500	)		(10.58		)
Unvested at end of year	752,701			11.90			776,500			10.66

Option Activity in Stock Incentive Plans

The following table summarizes option activity in our stock incentive plans for the year ended December 31, 2014.

	Number of Options		Weighted Average Exercise Price
Outstanding at beginning of year	1,102,650			$	26.68
Expired	(1,066,650	)		(26.62		)
Outstanding and exercisable at end of year	36,000			28.58