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Stock-based compensation (Tables)

9 Months Ended

Sep. 30, 2018

Executive Officers

Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]

(Not in thousands)	Shares		Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2016	383,982	$	26.35
Granted	212,200		42.57
Performance Shares Quantity Adjustment	(232,989)		29.10
Vested	(67,853)		48.54
Non-vested at December 31, 2017	295,340	$	30.75
Granted	236,115		45.69
Performance Shares Quantity Adjustment	182,813		30.58
Vested	(293,707)		34.40
Forfeited	(6,652)		33.14
Non-vested at September 30, 2018	413,909	$	36.57

Directors

Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]

(Not in thousands)	Restricted Stock		Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2016	-	$	-
Granted	25,771		38.42
Vested	(25,771)		38.42
Forfeited	-		-
Non-vested at December 31, 2017	-	$	-
Granted	25,159		46.71
Vested	(25,159)		46.71
Forfeited	-		-
Non-vested at September 30, 2018	-	$	-

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