Stock-based compensation (Tables)

3 Months Ended

Mar. 31, 2019

Executive Officers

Schedule of Unvested Restricted Stock Units Roll Forward

(Not in thousands)	Shares		Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2017	295,340	$	30.75
Granted	239,062		45.81
Performance Shares Quantity Adjustment	234,076		33.09
Vested	(372,271)		35.83
Forfeited	(14,021)		37.35
Non-vested at December 31, 2018	382,186	$	36.41
Granted	149,986		55.05
Performance Shares Quantity Adjustment	22,973		55.51
Vested	(177,913)		46.12
Non-vested at March 31, 2019	377,232	$	40.40

Directors

Schedule of Unvested Restricted Stock Units Roll Forward

(Not in thousands)	Restricted Stock		Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2017	-	$	-
Granted	25,159		46.71
Vested	(25,159)		46.71
Forfeited	-		-
Non-vested at December 31, 2018	-	$	-
Granted	1,052		49.25
Vested	(1,052)		49.25
Forfeited	-		-
Non-vested at March 31, 2019	-	$	-