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Stockholders' Equity
 6 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Stockholders' Equity
Stockholders' Equity

Common Stock    
The following table provides a reconciliation of the beginning and ending shares of common stock outstanding for the six months ended June 30, 2017 and the year ended December 31, 2016:
 
June 30, 2017
 
December 31, 2016
Balance, beginning of period
116,416,900

 
101,517,009

Issuance of common stock
41,020

 
14,063,100

Nonvested share-based awards, net of withheld shares
87,034

 
836,791

Balance, end of period
116,544,954

 
116,416,900



Common Stock Authorization
On May 2, 2017, the Company's shareholders approved an amendment to the Company's Articles of Incorporation to increase the number of authorized shares of common stock from 150,000,000 to 300,000,000.

At-The-Market Equity Offering Program
No shares were sold under this program during the six months ended June 30, 2017. The Company has 5,868,697 authorized shares remaining available to be sold under the current sales agreements as of July 31, 2017.

Common Stock Dividends
During the six months ended June 30, 2017, the Company declared and paid common stock dividends totaling $0.60 per share. On August 1, 2017, the Company declared a quarterly common stock dividend in the amount of $0.30 per share payable on August 31, 2017 to stockholders of record on August 11, 2017.

Accumulated Other Comprehensive Loss
The following table represents the changes in balances of each component and the amounts reclassified out of accumulated other comprehensive loss related to the Company during the six months ended June 30, 2017 and 2016:
 
Forward-starting Interest Rate Swaps
 
(Dollars in thousands)
2017
 
2016
 
Beginning balance
$
(1,401
)
 
$
(1,569
)
 
Amounts reclassified from accumulated other comprehensive loss
85

 
84

 
Net accumulated other comprehensive income
85

 
84

 
Ending balance
$
(1,316
)
 
$
(1,485
)
 


Earnings Per Common Share
The following table sets forth the computation of basic and diluted earnings per common share for the three and six months ended June 30, 2017 and 2016.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(Dollars in thousands, except per share data)
2017
 
2016
 
2017
 
2016
Weighted average Common Shares outstanding
 
 
 
 
 
 
 
Weighted average Common Shares outstanding
116,528,181

 
105,306,479

 
116,499,667

 
103,970,376

Nonvested shares
(1,807,082
)
 
(1,318,730
)
 
(1,801,448
)
 
(1,260,457
)
Weighted average Common Shares outstanding—Basic
114,721,099

 
103,987,749

 
114,698,219

 
102,709,919

Weighted average Common Shares outstanding—Basic
114,721,099

 
103,987,749

 
114,698,219

 
102,709,919

Dilutive effect of restricted stock
861,037

 
691,064

 
796,283

 
646,341

Dilutive effect of employee stock purchase plan
92,228

 
90,732

 
102,327

 
114,274

Weighted average Common Shares outstanding—Diluted
115,674,364

 
104,769,545

 
115,596,829

 
103,470,534

Net Income
 
 
 
 
 
 
 
Income from continuing operations
$
25,224

 
$
12,157

 
$
57,082

 
$
21,320

Discontinued operations
—

 
(12
)
 
(12
)
 
(20
)
Net income
$
25,224

 
$
12,145

 
$
57,070

 
$
21,300

Basic Earnings Per Common Share

 

 
 
 
 
Income from continuing operations
$
0.22

 
$
0.12

 
$
0.50

 
$
0.21

Discontinued operations
0.00

 
0.00

 
0.00

 
0.00

Net income
$
0.22

 
$
0.12

 
$
0.50

 
$
0.21

Diluted Earnings Per Common Share

 

 
 
 
 
Income from continuing operations
$
0.22

 
$
0.12

 
$
0.49

 
$
0.21

Discontinued operations
0.00

 
0.00

 
0.00

 
0.00

Net income
$
0.22

 
$
0.12

 
$
0.49

 
$
0.21



Incentive Plans
A summary of the activity under the stock-based incentive plans for the three and six months ended June 30, 2017 and 2016 is included in the table below.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Stock-based awards, beginning of period
1,814,039

 
1,326,746

 
1,786,497

 
1,092,262

Granted
23,231

 
21,374

 
103,615

 
321,580

Vested
(39,584
)
 
(36,951
)
 
(92,426
)
 
(102,673
)
Stock-based awards, end of period
1,797,686

 
1,311,169

 
1,797,686

 
1,311,169



During the six months ended June 30, 2017 and 2016, the Company withheld 16,581 and 14,442 shares of common stock, respectively, from participants to pay estimated withholding taxes related to shares that vested. No such shares were withheld during the three months ended June 30, 2017.

In addition to the stock-based incentive plans, the Company maintains the 2000 Employee Stock Purchase Plan (the "Purchase Plan"). A summary of the activity under the Purchase Plan for the three and six months ended June 30, 2017 and 2016 is included in the table below.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Outstanding and exercisable, beginning of period
365,618

 
361,955

 
316,321

 
340,958

Granted
—

 
—

 
206,824

 
198,450

Exercised
(7,595
)
 
(10,839
)
 
(19,030
)
 
(37,528
)
Forfeited
(13,451
)
 
(6,208
)
 
(27,233
)
 
(13,890
)
Expired
—

 
—

 
(132,310
)
 
(143,082
)
Outstanding and exercisable, end of period
344,572

 
344,908

 
344,572

 
344,908