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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Non-controlling Interest
Balance at beginning of period (in shares) at Dec. 31, 2015   155,146          
Balance at beginning of period at Dec. 31, 2015 $ 1,451,426 $ 2,045 $ 712,486 $ 531,621 $ (25,555) $ (9,298) $ 240,127
Increase (Decrease) in Stockholders' Equity              
Net loss (47,695)     (32,170)     (15,525)
Foreign currency translation adjustments 1,750       1,306   444
Change in marketable securities 656       491   165
Equity-based compensation expense 8,528   8,528        
Distributions to noncontrolling interest (8,027)           (8,027)
Common stock dividends (46,842)     (46,842)      
Preferred stock dividends (1)     (1)      
Common shares issued upon vesting of restricted stock units (in shares)   384          
Common shares issued upon vesting of restricted stock units 0 $ 4 (4)        
Common shares issued for employee stock purchase plan (ESPP) (in shares)   76          
Common shares issued for employee stock purchase plan (ESPP) 973 $ 1 972        
Treasury shares withheld (in shares)   (91)          
Treasury shares withheld (1,396)         (1,396)  
Balance at end of period (in shares) at Jun. 30, 2016   155,515          
Balance at end of period at Jun. 30, 2016 1,359,372 $ 2,050 721,982 452,608 (23,758) (10,694) 217,184
Balance at beginning of period (in shares) at Dec. 31, 2016   222,401          
Balance at beginning of period at Dec. 31, 2016 1,311,319 $ 2,802 1,036,786 317,270 (32,977) (12,562) 0
Increase (Decrease) in Stockholders' Equity              
Net loss (52,613)     (52,613)     0
Foreign currency translation adjustments 1,321       1,321   0
Change in marketable securities (241)       (241)   0
Equity-based compensation expense 9,116   9,116        
Common stock dividends (33,426)     (33,426)      
Common shares issued upon vesting of restricted stock units (in shares)   685          
Common shares issued upon vesting of restricted stock units 0 $ 7 (7)        
Common shares issued for employee stock purchase plan (ESPP) (in shares)   50          
Common shares issued for employee stock purchase plan (ESPP) 526 $ 1 525     0  
Treasury shares issued upon vesting of restricted stock units (in shares)   1          
Treasury shares issued upon vesting of restricted stock units (8)   (31)     23  
Treasury shares issued for ESPP (in shares)   105          
Treasury shares issued for ESPP 740 $ 1 (903)     1,642  
Treasury shares withheld (in shares)   (190)          
Treasury shares withheld (2,241)         (2,241)  
Balance at end of period (in shares) at Jun. 30, 2017   223,052          
Balance at end of period at Jun. 30, 2017 $ 1,234,493 $ 2,811 $ 1,045,486 $ 231,231 $ (31,897) $ (13,138) $ 0