Stockholders' Equity and Equity Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Summary of all stock award activity

A summary of the stock award activity is as follows:

	Nine Months Ended September 30, 2017
	Stock Awards		Weighted Average Award Date Fair Value
Outstanding at January 1, 2017	1,501,021		$	18.78
Restricted stock units awarded	248,547		22.96
Performance stock units awarded	213,436		23.04
Restricted shares distributed	(167,130	)	22.77
Restricted stock units distributed	(90,663	)	20.87
Performance stock units distributed	(49,672	)	21.95
Restricted shares forfeited	(1,084	)	23.01
Restricted stock units forfeited	(54,548	)	19.84
Performance stock units forfeited	(100,896	)	19.17
Outstanding at September 30, 2017	1,499,011		$	19.34

Summary of all deferred stock unit activity

A summary of deferred stock unit activity is as follows:

	Nine Months Ended September 30, 2017
	Deferred Stock Units		Weighted Average Award Date Fair Value
Outstanding at January 1, 2017	253,445		$	19.93
Awarded	45,042		23.53
Distributed	(30,559	)	23.57
Outstanding at September 30, 2017	267,928		$	20.12

Financial data for stock option exercises

Financial data for stock option exercises are summarized as follows (in thousands):

	Nine Months Ended September 30,
	2017		2016
Amount collected from stock option exercises	$	—	$	306
Total intrinsic value of stock option exercises	—		47
Tax shortfall of stock option exercises recorded in additional paid-in-capital	—		315
Aggregate intrinsic value of outstanding stock options	478		102
Aggregate intrinsic value of exercisable stock options	478		102