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EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION, Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Apr. 30, 2016
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Apr. 30, 2017
Jan. 25, 2017
Jun. 30, 2016
Restricted Stock Units (RSUs) [Member]                    
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value [Roll Forward]                    
Total intrinsic value   $ 2,700   $ 2,600 $ 9,400 $ 7,800        
Total grant date fair value   2,500   $ 2,000 $ 8,700 $ 7,000        
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Period following change of control         18 months          
Time-Based Restricted Stock Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unrecognized compensation expense   $ 23,500     $ 23,500          
Weighted average service period for recognition of unrecognized compensation costs         2 years 4 months 24 days          
Restricted Stock Unit Activity, Number of Shares [Roll Forward]                    
Nonvested, beginning of period (in shares)         535,000          
Granted (in shares)         236,000          
Vested (in shares) [1]         (140,000)          
Canceled and forfeited (in shares)         (4,000)          
Nonvested, end of period (in shares)   627,000     627,000          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value [Roll Forward]                    
Nonvested, beginning of period (in dollars per share) [2]         $ 46.62          
Granted (in dollars per share) [2]         46.35          
Vested (in dollars per share) [1],[2]         43.90          
Canceled and forfeited (in dollars per share) [2]         46.96          
Nonvested, end of period (in dollars per share) [2]   $ 47.12     $ 47.12          
Time-Based Restricted Stock Units [Member] | Employees [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period         4 years          
Vesting percentage after first year         5.00%          
Additional vesting percentage after second year         10.00%          
Additional vesting percentage after third year         15.00%          
Additional vesting percentage after fourth year         70.00%          
Time-Based Restricted Stock Units [Member] | Non-Employee Directors [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting percentage after first year         100.00%          
Performance-Based Restricted Stock Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unrecognized compensation expense   $ 11,100     $ 11,100          
Weighted average service period for recognition of unrecognized compensation costs         1 year 10 months 24 days          
Restricted Stock Unit Activity, Number of Shares [Roll Forward]                    
Nonvested, beginning of period (in shares)         439,000          
Granted (in shares)         137,000          
Vested (in shares) [1]         (62,000)          
Canceled and forfeited (in shares)         0          
Nonvested, end of period (in shares)   514,000     514,000          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value [Roll Forward]                    
Nonvested, beginning of period (in dollars per share) [2]         $ 47.40          
Granted (in dollars per share) [2]         45.84          
Vested (in dollars per share) [1],[2]         40.82          
Canceled and forfeited (in dollars per share) [2]         0          
Nonvested, end of period (in dollars per share) [2]   $ 47.78     $ 47.78          
FY 2017 Performance RSUs [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Approved restricted stock unit awards (performance vesting) (in shares) 152,000                  
Share-based compensation expense, if future performance is met     $ 0       $ 600      
Aggregate estimated grant date fair value                   $ 6,800
FY 2017 Performance RSUs [Member] | Target Condition One [Member]                    
Performance target of restricted stock units by vesting date [Abstract]                    
Shares issuable upon settlement         25.00%          
Consolidated income from operations         90% of target          
Vesting Date         Third anniversary of the date of grant          
FY 2017 Performance RSUs [Member] | Target Condition Two [Member]                    
Performance target of restricted stock units by vesting date [Abstract]                    
Shares issuable upon settlement         25.00%          
Consolidated income from operations         90% of target          
Vesting Date         Fourth anniversary of the date of grant          
FY 2017 Performance RSUs [Member] | Target Condition Three [Member]                    
Performance target of restricted stock units by vesting date [Abstract]                    
Shares issuable upon settlement         25.00%          
Consolidated income from operations         100% of target          
Vesting Date         Third anniversary of the date of grant          
FY 2017 Performance RSUs [Member] | Target Condition Four [Member]                    
Performance target of restricted stock units by vesting date [Abstract]                    
Shares issuable upon settlement         25.00%          
Consolidated income from operations         100% of target          
Vesting Date         Fourth anniversary of the date of grant          
FY 2017 Performance RSUs [Member] | Target Condition Three And Four [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Aggregate estimated grant date fair value                 $ 4,000  
FY 2017 Performance RSUs Vesting for CEO [Member] | Target Condition One [Member]                    
Performance target of restricted stock units by vesting date [Abstract]                    
Shares issuable upon settlement         18.00%          
Consolidated income from operations         90% of target          
Vesting Date         Third anniversary of the date of grant          
FY 2017 Performance RSUs Vesting for CEO [Member] | Target Condition Two [Member]                    
Performance target of restricted stock units by vesting date [Abstract]                    
Shares issuable upon settlement         18.00%          
Consolidated income from operations         90% of target          
Vesting Date         Fourth anniversary of the date of grant          
FY 2017 Performance RSUs Vesting for CEO [Member] | Target Condition Three [Member]                    
Performance target of restricted stock units by vesting date [Abstract]                    
Shares issuable upon settlement         32.00%          
Consolidated income from operations         100% of target          
Vesting Date         Third anniversary of the date of grant          
FY 2017 Performance RSUs Vesting for CEO [Member] | Target Condition Four [Member]                    
Performance target of restricted stock units by vesting date [Abstract]                    
Shares issuable upon settlement         32.00%          
Consolidated income from operations         100% of target          
Vesting Date         Fourth anniversary of the date of grant          
FY 2017 Performance RSUs Vesting 1 and CEO [Member] | Target Condition One And Two [Member]                    
Restricted Stock Unit Activity, Number of Shares [Roll Forward]                    
Granted (in shares) 68,000                  
FY 2017 Performance RSUs Vesting 1 and CEO [Member] | Target Condition Three And Four [Member]                    
Restricted Stock Unit Activity, Number of Shares [Roll Forward]                    
Granted (in shares) 84,000                  
FY 2018 Performance RSUs [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Approved restricted stock unit awards (performance vesting) (in shares)               137,000    
FY 2018 Performance RSUs [Member] | Target Condition One [Member]                    
Performance target of restricted stock units by vesting date [Abstract]                    
Shares issuable upon settlement         50.00%          
Consolidated income from operations before income tax provision         90% of target          
Vesting Date         Third anniversary of the date of grant          
FY 2018 Performance RSUs [Member] | Target Condition Two [Member]                    
Performance target of restricted stock units by vesting date [Abstract]                    
Shares issuable upon settlement         50.00%          
Consolidated income from operations before income tax provision         90% of target          
Vesting Date         Fourth anniversary of the date of grant          
[1] The number of restricted stock units vested includes shares that we withheld on behalf of our employees to satisfy the statutory tax withholding requirements.
[2] The weighted average grant date fair value of restricted stock units is based on the number of shares and the closing market price of our common stock on the date of grant.