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Stockholders Equity (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of changes in equity

A schedule of consolidated changes in equity for the six months ended June 30, 2019 is as follows (shares in thousands):
 
 
Common
Stock
(Number of
Shares)
 
Common
Stock
(Amount)
 
Additional
Paid-In
Capital
 
Treasury
Stock
(Number of
Shares)
 
Treasury
Stock (Amount)
 
Retained
Earnings
 
Accumulated
Other
Non-Owner
Changes to
Equity
 
Total
Stockholders’
Equity
December 31, 2018
 
63,367

 
$
634

 
$
470,818

 
12,034

 
$
(441,668
)
 
$
1,363,772

 
$
(190,500
)
 
$
1,203,056

Comprehensive income
 
—

 
—

 
—

 
—

 
—

 
33,992

 
(8,178
)
 
25,814

Dividends declared ($0.16 per share)
 
—

 
—

 
—

 
—

 
—

 
(8,217
)
 
—

 
(8,217
)
Employee stock plans
 
51

 
—

 
4,039

 
1

 
(80
)
 
(109
)
 
—

 
3,850

March 31, 2019
 
63,418

 
$
634

 
$
474,857

 
12,035

 
$
(441,748
)
 
$
1,389,438

 
$
(198,678
)
 
$
1,224,503

Comprehensive income
 
—

 
—

 
—

 
—

 
—

 
37,616

 
4,698

 
42,314

Dividends declared ($0.16 per share)
 
—

 
—

 
—

 
—

 
—

 
(8,086
)
 
—

 
(8,086
)
Common stock repurchases
 
—

 
—

 
—

 
900

 
(50,347
)
 
—

 
—

 
(50,347
)
Employee stock plans
 
18

 
—

 
3,285

 
2

 
(106
)
 
(178
)
 
—

 
3,001

June 30, 2019
 
63,436

 
$
634

 
$
478,142

 
12,937

 
$
(492,201
)
 
$
1,418,790

 
$
(193,980
)
 
$
1,211,385


A schedule of consolidated changes in equity for the six months ended June 30, 2018 is as follows (shares in thousands):
 
 
Common
Stock
(Number of
Shares)
 
Common
Stock
(Amount)
 
Additional
Paid-In
Capital
 
Treasury
Stock
(Number of
Shares)
 
Treasury
Stock (Amount)
 
Retained
Earnings
 
Accumulated
Other
Non-Owner
Changes to
Equity
 
Total
Stockholders’
Equity
December 31, 2017
 
63,034

 
$
630

 
$
457,365

 
9,656

 
$
(297,998
)
 
$
1,206,723

 
$
(106,399
)
 
$
1,260,321

Comprehensive income
 
—

 
—

 
—

 
—

 
—

 
38,818

 
30,513

 
69,331

Dividends declared ($0.14 per share)
 
—

 
—

 
—

 
—

 
—

 
(7,453
)
 
—

 
(7,453
)
Common stock repurchases
 
—

 
—

 
—

 
533

 
(33,541
)
 
—

 
—

 
(33,541
)
Reclassification pursuant to
accounting guidance related to
U.S. Tax Reform (Note 3)

 
—

 
—

 
—

 
—

 
—

 
19,331

 
(19,331
)
 
—

Cumulative effect of change in accounting guidance related to Revenue (Note 3)
 
—

 
—

 
—

 
—

 
—

 
4,295

 
—

 
4,295

Employee stock plans
 
20

 
1

 
2,874

 
1

 
(68
)
 
(174
)
 
—

 
2,633

March 31, 2018
 
63,054

 
$
631

 
$
460,239

 
10,190

 
$
(331,607
)
 
$
1,261,540

 
$
(95,217
)
 
$
1,295,586

Comprehensive income
 
—

 
—

 
—

 
—

 
—

 
49,429

 
(61,920
)
 
(12,491
)
Dividends declared ($0.16 per share)
 
—

 
—

 
—

 
—

 
—

 
(8,342
)
 
—

 
(8,342
)
Common stock repurchases
 
—

 
—

 
—

 
1,422

 
(84,574
)
 
—

 
—

 
(84,574
)
Employee stock plans
 
13

 
—

 
3,078

 
2

 
(107
)
 
13

 
—

 
2,984

June 30, 2018
 
63,067

 
$
631

 
$
463,317

 
11,614

 
$
(416,288
)
 
$
1,302,640

 
$
(157,137
)
 
$
1,193,163