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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Common Stock Held in Treasury, at Cost [Member]
Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2015 $ 1,958,346 $ 1,478,439 $ 15,215 $ 0 $ 450 $ 190,813 $ (118) $ 273,547
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Total comprehensive income 20,112 74,843 (54,205)         (526)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2014-13 [Member] 0 6,442           (6,442)
Stock-based compensation 5,253         5,253    
Cost of shares (acquired) issued under equity plan (505) (127)         (378)  
Payments for Repurchase of Warrants (2,717) (1,916)       (801)    
Stock Issued During Period, Value, New Issues 2       2 0    
Noncontrolling Interest, Decrease from Deconsolidation (2,469)             (2,469)
Proceeds from Warrant Exercises 2       0 2    
Ending balance at Dec. 31, 2016 1,978,024 1,557,681 (38,990) 0 452 195,267 (496) 264,110
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Total comprehensive income (335,376) (328,715) (6,661)         0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2018-02 [Domain]     (6,588)          
Stock-based compensation 4,293         4,293    
Cost of shares (acquired) issued under equity plan (1,547) (1,572)         25  
Stock Issued During Period, Value, New Issues 1 0 0 0 1 0    
Proceeds from Warrant Exercises 0              
Ending balance at Dec. 31, 2017 1,645,258 1,233,845 (52,239) 0 453 199,560 (471) 264,110
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Total comprehensive income 273,823 267,399 6,424         0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2016-01 [Member]   2,900 (2,900)          
Stock-based compensation 11,854         11,854    
Cost of shares (acquired) issued under equity plan (1,158) (1,156)         (2)  
Stock Issued During Period, Value, New Issues 1 0 0   1 0    
Proceeds from Warrant Exercises 3       0 3 0  
Ending balance at Dec. 31, 2018 1,633,147 1,421,302 $ (48,715) $ 0 $ 454 219,429 $ (473) 41,150
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
AMPS Impact on Stockholders Equity $ (296,634) $ (81,686)       $ 8,012   $ (222,960)