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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

A summary of activity and weighted average exercise prices related to the NSOs is as follows:



	Six Months Ended June 30, 2019
	Shares		Weighted Avg. Exercise Price
Outstanding, beginning of period	2,431,397		$	36.54
Exercised	(357,852	)	31.84
Forfeited	(44,740	)	33.10
Cancelled	(9,720	)	57.24
Outstanding, end of period	2,019,085		$	37.35
Vested and exercisable, end of period	1,373,655		$	39.65

A summary of activity and weighted average fair values related to the RSUs is as follows:



	Six Months Ended June 30, 2019
	Shares		Weighted Avg. Fair Value
Outstanding, beginning of period	1,123,554		$	35.46
Granted	468,469		46.03
Dividend equivalent units granted	12,621		46.11
Vested	(387,343	)	34.68
Dividend equivalent units vested	(23,342	)	37.58
Forfeited	(39,285	)	37.29
Dividend equivalent units forfeited	(1,570	)	38.77
Outstanding and nonvested, end of period	1,153,104		$	40.03

A summary of activity and weighted average fair values related to the restricted stock awards is as follows:

A summary of activity and weighted average fair values related to the PSUs and Supplemental PSUs is as follows:



	Six Months Ended June 30, 2019
	Shares		Weighted Avg. Fair Value
Outstanding, beginning of period	161,515		$	37.30
Granted (1)	49,342		46.43
Dividend equivalent units granted	2,121		42.51
Vested	(119,282	)	36.60
Dividend equivalent units vested	(6,548	)	37.19
Outstanding and nonvested, end of period	87,148		$	42.09


(1)	Represents shares of PSUs for which performance targets have been established and which are deemed granted under U.S. GAAP.

As of June 30, 2019, the Company had not yet recognized compensation cost on nonvested awards as follows (dollars in thousands):



	Unrecognized Compensation Cost		Weighted Avg. Remaining Recognition Period
Nonvested awards	$	44,383	2.4

Six Months Ended
June 30, 2019

Weighted Avg.
Fair Value

Outstanding, beginning of period

Outstanding and nonvested, end of period