Stockholders' Equity and Equity Compensation (Tables)

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Summary of all stock award activity

A summary of the stock award activity is as follows:

	Six Months Ended   June 30, 2017
	Stock Awards		Weighted Average Award Date Fair Value
Outstanding at January 1, 2017	1,501,021		$	18.78
Restricted stock units awarded	235,655		23.03
Performance stock units awarded	213,436		23.04
Restricted shares distributed	(164,675	)	22.75
Restricted stock units distributed	(64,111	)	22.15
Performance stock units distributed	(49,672	)	21.95
Restricted shares forfeited	(1,084	)	23.01
Restricted stock units forfeited	(32,266	)	19.60
Performance stock units forfeited	(66,208	)	19.13
Outstanding at June 30, 2017	1,572,096		$	19.31

Summary of all deferred stock unit activity

A summary of deferred stock unit activity is as follows:

	Six Months Ended June 30, 2017
	Deferred Stock Units		Weighted Average Award Date Fair Value
Outstanding at January 1, 2017	253,445		$	19.93
Awarded	42,871		23.59
Distributed	(17,028	)	23.96
Outstanding at June 30, 2017	279,288		$	20.24

Financial data for stock option exercises

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

	Six Months Ended  June 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	—		293
Aggregate intrinsic value of outstanding stock options	349		149
Aggregate intrinsic value of exercisable stock options	349		149