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Shareholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Schedule of Share-based compensation expense and related tax benefits
Share-based compensation expense and related tax benefits were as follows:
 
Three Months Ended June 30
 
Six Months Ended June 30
(In thousands)
2018
 
2017
 
2018
 
2017
Share-based compensation expense
$
1,615

 
$
2,746

 
$
2,517

 
$
6,092

Related tax benefits
$
339

 
$
961

 
$
529

 
$
2,132
Reclassification adjustments related to available-for-sale securities
Amounts reclassified from AOCI to net income and the amounts of deferred tax expense (benefit) included in OCI were as follows:
 
Three Months Ended June 30
 
Six Months Ended June 30
(In thousands)
2018
 
2017
 
2018
 
2017
Reclassifications from AOCI to net income:
 
 
 
 
 
 
 
Realized investment gains (losses)
$
(1,691
)
 
$
(653
)
 
$
726

 
$
963

Non-credit impairment losses reclassified to earnings, due to sale of securities or reclassification as a credit loss
—

 
(3
)
 
—

 
(3
)
Total gains (losses) reclassified, before tax effect
(1,691
)
 
(656
)
 
726

 
960

Tax effect*
355

 
230

 
(153
)
 
(336
)
Net reclassification adjustments
$
(1,336
)
 
$
(426
)
 
$
573

 
$
624

 
 
 
 
 
 
 
 
Deferred tax expense (benefit) included in OCI
$
(2,185
)
 
$
2,983

 
$
(9,245
)
 
$
4,464

* Tax effects were computed using a 21% and 35% rate for the three and six months ended June 30, 2018 and 2017, respectively.