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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Excess Purchase Price over Predecessor Basis [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Parent [Member]
Noncontrolling Interest [Member]
Total [Member]
Total
Balance (in shares) at Dec. 31, 2014 69,122,271   (198,312)              
Balance at Dec. 31, 2014 $ 691 $ 434,906 $ (8,341) $ (202,116) $ 280,426 $ (15,767) $ 489,799 $ 489,799  
Net unrealized gain (loss) on derivatives (965) (965) (965) $ (965)
Foreign currency translation adjustment (7,624) (7,624) (7,624) (7,624)
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price (in shares) 460,398                
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price $ 5 (9,626) (9,621) (9,621)  
Net share settlement of restricted stock awards (in shares)   (65,763)              
Net share settlement of restricted stock awards $ (3,233) (3,233) (3,233)  
Stock repurchases (in shares)   (3,303,500)              
Stock repurchases $ (99,942) (99,942) (99,942)  
Excess tax benefits from equity awards 9,559 9,559 9,559  
Share-based compensation 8,241 8,241 8,241  
Dividends declared 29 29 29  
Pension liability adjustment 1,881 1,881 1,881 1,881
Net income 77,747 77,747 77,747 77,747
Redemption value adjustment                  
Balance (in shares) at Dec. 31, 2015 69,582,669   (3,567,575)              
Balance at Dec. 31, 2015 $ 696 443,109 $ (111,516) (202,116) 358,173 (22,475) 465,871 465,871  
Net unrealized gain (loss) on derivatives 535 535 535 535
Foreign currency translation adjustment (18,545) (18,545) 13 (18,532) (18,545)
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price (in shares) 678,812                
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price $ 6 (11,473) (11,467) (11,467)  
Net share settlement of restricted stock awards (in shares)   (28,593)              
Net share settlement of restricted stock awards $ (949) (949) (949)  
Stock repurchases (in shares)   (3,968,706)              
Stock repurchases $ (149,937) (149,937) (149,937)  
Excess tax benefits from equity awards 7,920 7,920 7,920  
Share-based compensation 9,493 9,493 9,493  
Pension liability adjustment 322 322 322 322
Net income 98,788 98,788 (76) 98,712 98,788
Acquisition of business 53 53  
Redemption value adjustment (909) (909) (909) (909)
Balance (in shares) at Dec. 31, 2016 70,261,481   (7,564,874)              
Balance at Dec. 31, 2016 $ 702 449,049 $ (262,402) (202,116) 456,052 (40,163) 401,122 (10) 401,112 401,122
Net unrealized gain (loss) on derivatives 3,712 3,712 3,712 3,712
Foreign currency translation adjustment 15,191 15,191 (14) 15,177 15,191
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price (in shares) 558,692                
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price $ 6 2,686 2,692 2,692  
Net share settlement of restricted stock awards (in shares)   (39,500)              
Net share settlement of restricted stock awards $ (1,591) (1,591) (1,591)  
Stock repurchases (in shares)   (844,500)              
Stock repurchases $ (30,012) (30,012) (30,012)  
Share-based compensation 10,205 10,205 10,205  
Pension liability adjustment 62 62 62 62
Net income 159,386 159,386 119 159,505 159,386
Redemption value adjustment 909 909 909 909
Change in noncontrolling interest share (2,124) (2,124) 184 (1,940)  
Balance (in shares) at Dec. 31, 2017 70,820,173   (8,448,874)              
Balance at Dec. 31, 2017 $ 708 $ 459,816 $ (294,005) $ (202,116) $ 616,347 $ (21,198) $ 559,552 $ 279 $ 559,831 $ 559,552