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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Reconciliation of the beginning and ending common stock outstanding
The Company had no preferred shares outstanding and had common shares outstanding for the three years ended December 31, 2014 as follows: 
 
Year Ended December 31,
 
2014

 
2013

 
2012

Balance, beginning of year
95,924,339

 
87,514,336

 
77,843,883

Issuance of common stock
3,073,445

 
8,293,369

 
9,275,895

Non-vested stock-based awards, net of withheld shares and forfeitures
(169,686
)
 
116,634

 
394,558

Balance, end of year
98,828,098

 
95,924,339

 
87,514,336
Schedule of sale of stock under market equity offering Program
The following table details the shares sold under this program.
 
 
 
Shares Sold

 
Sales Price Per Share
 
Net Proceeds
 (in millions)

2014
2,099,380

3,009,761

 
$24.35 - $27.53
 
$
75.7

2013
5,207,871

5,207,871

 
$24.19 - $30.49
 
$
140.6
Change in ownership interest in less-than-wholly-owned subsidiary
The following schedule discloses the effects of changes in the Company's ownership interest in its less-than-wholly-owned subsidiary on the Company's stockholders' equity:
 
 
Year Ended December 31,
(Dollars in thousands)
 
2014

 
2013

 
2012

Net income attributable to common stockholders
 
$
31,887

 
$
6,946

 
$
5,465

Transfers to noncontrolling interest:
 
 
 
 
 
 
Net decrease in the Company's additional paid-in capital for purchase of subsidiary partnership interest
 
(6,577
)
 
—

 
—

Net transfers to the noncontrolling interest
 
(6,577
)
 
—

 
—

Change to the Company's total stockholders' equity from net income attributable to common stockholders and transfers to noncontrolling interest
 
$
25,310

 
$
6,946

 
$
5,465
Reconciliation of beginning and ending balances of accumulated other comprehensive income
The following table represents the amounts reclassified out of Accumulated other comprehensive income (loss) related to the Company's pension plan during the years ended December 31, 2014 and 2013:
 
Year Ended December 31,
(Dollars in thousands)
2014

 
2013

Beginning balance
$
51

 
$
(2,092
)
Other comprehensive income (loss) before reclassifications
(1,850
)
 
1,952

Amounts reclassified from accumulated other comprehensive income (loss)
(720
)
 
191

Net current-period other comprehensive income (loss)
(2,570
)
 
2,143

Ending balance
$
(2,519
)
 
$
51
Reclassifications out of accumulated other comprehensive income
The following table represents the details regarding the reclassifications from Accumulated other comprehensive income (loss) related to the Company's pension plan during the years ended December 31, 2014:
Details about accumulated other comprehensive income (loss) components
 
Amount reclassified from accumulated other comprehensive income (loss)

 
Affected line item in the statement where net income is presented
(Dollars in thousands)
 
 
 
 
Prior service costs
 
$
(1,189
)
 
General and administrative expenses
Actuarial loss
 
469

 
General and administrative expenses
 
 
$
(720
)