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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Accumulated Deficit
Noncontrolling Interest
Beginning balance at Dec. 31, 2017 $ 735,618 $ 769 $ 3,093,058 $ 1,197 $ (76,732) $ (2,241,243) $ (41,431)
Beginning, shares at Dec. 31, 2017   76,880,862     (5,930,380)    
Increase (Decrease) in Stockholders' Equity              
Cash dividends (24,018)         (24,018)  
Shares issued in employee stock purchase plan 416 $ 1 415        
Shares issued in employee stock purchase plan, shares   50,046          
Stock-based compensation, net of forfeitures 3,513 $ 9 3,568       (64)
Stock-based compensation, net of forfeitures, shares   883,271     (32,905)    
Stock options exercised 262   262        
Stock options exercised, shares   29,855          
Merger-related adjustments 94,292 $ 576 52,815       40,901
Merger-related adjustments, shares   57,634,005          
Treasury stock purchased (1,041)       $ (1,041)    
Treasury stock purchased, shares         (109,466)    
Cash distribution to noncontrolling unitholders of the Partnership (11,766)           (11,766)
Comprehensive income              
Net income (loss) 6,218         (1,879) 8,097
Interest rate swap gain (loss), net of reclassifications to earnings 6,282     2,019     4,263
Amortization of terminated interest rate swaps 230     230      
Merger-related adjustments 5,670     5,670      
Impact of adoption of ASU 2018-02       258   (258)  
Ending balance at Jun. 30, 2018 830,725 $ 1,355 3,150,118 9,374 $ (77,773) (2,252,349) 0
Ending, shares at Jun. 30, 2018   135,478,039     (6,072,751)    
Beginning balance at Mar. 31, 2018 737,873 $ 778 3,094,881 3,194 $ (77,773) (2,238,800) (44,407)
Beginning, shares at Mar. 31, 2018   77,779,797     (6,072,751)    
Increase (Decrease) in Stockholders' Equity              
Cash dividends (15,486)         (15,486)  
Shares issued in employee stock purchase plan 193 $ 1 192        
Shares issued in employee stock purchase plan, shares   23,092          
Stock-based compensation, net of forfeitures 1,968   1,968        
Stock-based compensation, net of forfeitures, shares   11,290          
Stock options exercised 262   262        
Stock options exercised, shares   29,855          
Merger-related adjustments 94,292 $ 576 52,815       40,901
Merger-related adjustments, shares   57,634,005          
Comprehensive income              
Net income (loss) 4,149         1,937 2,212
Interest rate swap gain (loss), net of reclassifications to earnings 1,720     426     1,294
Amortization of terminated interest rate swaps 85     85      
Merger-related adjustments 5,670     5,670      
Ending balance at Jun. 30, 2018 830,725 $ 1,355 3,150,118 9,374 $ (77,773) (2,252,349) 0
Ending, shares at Jun. 30, 2018   135,478,039     (6,072,751)    
Beginning balance at Dec. 31, 2018 841,574 $ 1,358 3,177,982 5,773 $ (79,862) (2,263,677) 0
Beginning, shares at Dec. 31, 2018   135,787,509     (6,381,605)    
Increase (Decrease) in Stockholders' Equity              
Cash dividends (34,437)         (34,437)  
Shares issued in employee stock purchase plan 407   407        
Shares issued in employee stock purchase plan, shares   48,801          
Stock-based compensation, net of forfeitures 3,869 $ 11 3,858        
Stock-based compensation, net of forfeitures, shares   1,062,987     (108,917)    
Treasury stock purchased (857)       $ (857)    
Treasury stock purchased, shares         (87,036)    
Comprehensive income              
Net income (loss) 30,879         30,879  
Interest rate swap gain (loss), net of reclassifications to earnings (8,545)     (8,545)      
Amortization of terminated interest rate swaps 0            
Merger-related adjustments       0      
Ending balance at Jun. 30, 2019 832,890 $ 1,369 3,182,247 (2,772) $ (80,719) (2,267,235) 0
Ending, shares at Jun. 30, 2019   136,899,297     (6,577,558)    
Beginning balance at Mar. 31, 2019 842,292 $ 1,369 3,180,546 2,548 $ (80,719) (2,261,452) 0
Beginning, shares at Mar. 31, 2019   136,876,352     (6,484,075)    
Increase (Decrease) in Stockholders' Equity              
Cash dividends (17,206)         (17,206)  
Shares issued in employee stock purchase plan 189   189        
Shares issued in employee stock purchase plan, shares   19,073          
Stock-based compensation, net of forfeitures 1,512   1,512        
Stock-based compensation, net of forfeitures, shares   3,872     (93,483)    
Comprehensive income              
Net income (loss) 11,423         11,423  
Interest rate swap gain (loss), net of reclassifications to earnings (5,320)     (5,320)      
Amortization of terminated interest rate swaps 0            
Merger-related adjustments       0      
Ending balance at Jun. 30, 2019 $ 832,890 $ 1,369 $ 3,182,247 $ (2,772) $ (80,719) $ (2,267,235) $ 0
Ending, shares at Jun. 30, 2019   136,899,297     (6,577,558)