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STOCKHOLDERS' EQUITY (Tables)
 3 Months Ended
Mar. 31, 2016
Equity [Abstract]  
Changes in Stockholders' Equity
The changes in stockholders’ equity for the three months ended March 31, 2016 were as follows:
 
 
 
 
 
 
 
Accumulated
 
 
 
 
 
 
 
 
 
Other
 
Total
 
Common Stock
 
Retained
 
Comprehensive
 
Stockholders’
(in thousands, except share and per share data)
Shares
 
Amount
 
Earnings
 
Income (Loss)
 
Equity
BALANCE, DECEMBER 31, 2015
152,699,077

 
$
829,211

 
$
875,595

 
$
4,265

 
$
1,709,071

Net income
—

 
—

 
64,237

 
—

 
64,237

Repurchase and retirement of common stock
(28,875
)
 
(1,176
)
 
—

 
—

 
(1,176
)
Dividends declared ($0.1875 per share)
—

 
—

 
(28,634
)
 
—

 
(28,634
)
Stock option exercises
84,006

 
1,847

 
—

 
—

 
1,847

Shares issued under the Employee Stock Purchase Plan
23,276

 
647

 
—

 
—

 
647

Issuance of restricted stock
3,896

 
—

 
—

 
—

 
—

Forfeiture of restricted stock
(11,737
)
 
—

 
—

 
—

 
—

Forfeiture of performance shares
(3,626
)
 
—

 
—

 
—

 
—

Share-based compensation, net of forfeitures
—

 
4,933

 
—

 
—

 
4,933

Other comprehensive loss, net of tax
—

 
—

 
—

 
(2,162
)
 
(2,162
)
Other
—

 
51

 
—

 
—

 
51

BALANCE, MARCH 31, 2016
152,766,017

 
$
835,513

 
$
911,198

 
$
2,103

 
$
1,748,814

The changes in stockholders’ equity for the three months ended March 31, 2015 were as follows:
 
 
 
 
 
 
 
Accumulated
 
 
 
 
 
 
 
 
 
Other
 
Total
 
Common Stock
 
Retained
 
Comprehensive
 
Stockholders’
(in thousands, except share and per share data)
Shares
 
Amount
 
Earnings
 
Income (Loss)
 
Equity
BALANCE, DECEMBER 31, 2014
155,140,967

 
$
923,191

 
$
741,550

 
$
4,816

 
$
1,669,557

Net income
—

 
—

 
67,132

 
—

 
67,132

Repurchase and retirement of common stock
(11,917
)
 
(476
)
 
—

 
—

 
(476
)
Dividends declared on common stock ($0.1625 per share)
—

 
—

 
(25,220
)
 
—

 
(25,220
)
Stock option exercises
37,495

 
665

 
—

 
—

 
665

Shares issued under the Employee Stock Purchase Plan
17,267

 
581

 
—

 
—

 
581

Issuance of restricted stock
27,776

 
—

 
—

 
—

 
—

Forfeiture of restricted stock
(13,772
)
 
—

 
—

 
—

 
—

Share-based compensation, net of forfeitures
—

 
3,853

 
—

 
—

 
3,853

Other comprehensive loss, net of tax
—

 
—

 
—

 
(621
)
 
(621
)
BALANCE, MARCH 31, 2015
155,197,816

 
$
927,814

 
$
783,462

 
$
4,195

 
$
1,715,471
Changes in Accumulated Other Comprehensive Income
The following table provides the components of changes in AOCI for the three months ended March 31, 2016 and 2015:
 
Three months ended
 
March 31,
(in thousands)
2016
 
2015
Balance at the beginning of period
$
4,265

 
$
4,816

Derivative instruments
 
 
 
Reclassification of net loss relating to interest rate cash flow hedges from AOCI to interest expense — net (net of tax of $92 and $75 for the three months ended March 31, 2016 and 2015, respectively)
119

 
136

Loss on interest rate swaps relating to interest rate cash flow hedges (net of tax of $1,823 and $614 for the three months ended March 31, 2016 and 2015, respectively)
(2,542
)
 
(863
)
Derivative instruments, net of tax
(2,423
)
 
(727
)
Available-for-sale securities
 
 
 
Unrealized net gain on available-for-sale securities (net of tax of $187 and $76 for the three months ended March 31, 2016 and 2015, respectively)
261

 
106

Available-for-sale securities, net of tax
261

 
106

Total other comprehensive loss, net of tax
(2,162
)
 
(621
)
Balance at the end of period
$
2,103

 
$
4,195