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STOCKHOLDERS' EQUITY (Tables)
 9 Months Ended
Sep. 30, 2013
Equity [Abstract]  
Changes in Stockholders' Equity
The changes in stockholders’ equity for the nine months ended September 30, 2013 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, 2012
52,248,514

 
$
989,334

 
$
443,569

 
$
(18,048
)
 
$
1,414,855

Net income
—

 
—

 
156,569

 
—

 
156,569

Repurchase and retirement of common stock
(50,388
)
 
(4,508
)
 
—

 
—

 
(4,508
)
Dividends declared on common stock ($1.18 per share)
—

 
—

 
(61,821
)
 
—

 
(61,821
)
Stock option exercises
143,514

 
6,860

 
—

 
—

 
6,860

Shares issued under the Employee Stock Purchase Plan
19,024

 
1,353

 
—

 
—

 
1,353

Issuance of restricted stock
121,811

 
—

 
—

 
—

 
—

Forfeiture of restricted stock
(11,121
)
 
—

 
—

 
—

 
—

Share-based compensation, net of forfeitures
—

 
10,670

 
—

 
—

 
10,670

Other comprehensive income, net of tax
—

 
—

 
—

 
24,555

 
24,555

BALANCE, SEPTEMBER 30, 2013
52,471,354

 
$
1,003,709

 
$
538,317

 
$
6,507

 
$
1,548,533

The changes in stockholders’ equity for the nine months ended September 30, 2012 were as follows:
 
 
 
 
 
 
 
Accumulated
 
 
 
 
 
 
 
 
 
Other
 
Total
 
Common Stock
 
Retained
 
Comprehensive
 
Stockholders’
(in thousands, except share and per share data)
Shares
 
Amount
 
Earnings
 
Loss
 
Equity
BALANCE, DECEMBER 31, 2011
51,323,368

 
$
943,444

 
$
330,816

 
$
(15,368
)
 
$
1,258,892

Net income
—

 
—

 
139,620

 
—

 
139,620

Repurchase and retirement of common stock
(69,183
)
 
(4,896
)
 
—

 
—

 
(4,896
)
Dividends declared on common stock ($1.0825 per share)
—

 
—

 
(55,677
)
 
—

 
(55,677
)
Stock option exercises
108,693

 
3,796

 
—

 
—

 
3,796

Shares issued under the Employee Stock Purchase Plan
18,107

 
1,133

 
—

 
—

 
1,133

Issuance of restricted stock
153,381

 
—

 
—

 
—

 
—

Forfeiture of restricted stock
(9,929
)
 
—

 
—

 
—

 
—

Share-based compensation, net of forfeitures
—

 
11,378

 
—

 
—

 
11,378

Other
—

 
403

 
—

 
—

 
403

Other comprehensive loss, net of tax
—

 
—

 
—

 
(5,440
)
 
(5,440
)
BALANCE, SEPTEMBER 30, 2012
51,524,437

 
$
955,258

 
$
414,759

 
$
(20,808
)
 
$
1,349,209
Changes in Accumulated Other Comprehensive Income
The following table provides the components of changes in AOCI for the three and nine months ended September 30, 2013 and 2012:
 
Three months ended
 
Nine months ended
 
September 30,
 
September 30,
(in thousands)
2013
 
2012
 
2013
 
2012
Balance at the beginning of period
$
6,310

 
$
(19,492
)
 
$
(18,048
)
 
$
(15,368
)
Derivative instruments
 
 
 
 
 
 
 
Reclassification of gain relating to interest rate cash flow hedges from AOCI (net of tax of $71 and $9 for the three months ended September 30, 2013 and 2012, respectively, and net of tax of $90 and $21 for the nine months ended September 30, 2013 and 2012, respectively) (a)
110

 
15

 
139

 
52

Gain (loss) on interest rate swaps relating to interest rate cash flow hedges (net of tax of $862 for the three months ended September 30, 2012 and net of tax of $15,652 and $3,545 for the nine months ended September 30, 2013 and 2012, respectively)
—

 
(1,331
)
 
24,329

 
(5,492
)
Derivative instruments, net of tax
110

 
(1,316
)
 
24,468

 
(5,440
)
Available-for-sale securities
 
 
 
 
 
 
 
Unrealized gain on available-for-sale securities (net of tax of $56 for the three and nine months ended September 30, 2013)
87

 
—

 
87

 
—

Available-for-sale securities, net of tax
87

 
—

 
87

 
—

Total other comprehensive income (loss), net of tax
197

 
(1,316
)
 
24,555

 
(5,440
)
Balance at the end of period
$
6,507

 
$
(20,808
)
 
$
6,507

 
$
(20,808
)
____________________________
(a)
Reclassified from AOCI to interest expense — net.