EQUITY COMPENSATION PLANS (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Valuation Assumptions of Options Granted

The fair value of each option granted was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:

	For the Year Ended December 31,
	2020		2019		2018
Risk-free interest rate	1.0	%	1.7	%	2.7	%
Expected life	5.2 years		5.3 years		5.5 years
Expected volatility	43	%	37	%	34	%
Expected dividend yield	—	%	—	%	—	%

Schedule of Outstanding and Exercisable Options

The following is a summary of outstanding and exercisable options:

	For the Year Ended December 31,
In thousands, except per share amounts	2020			2019			2018
Outstanding Options	Shares	Weighted-Average Exercise Price		Shares	Weighted-Average Exercise Price		Shares	Weighted-Average Exercise Price
Outstanding at beginning of period	683	$	27.15	623	$	30.14	433	$	33.37
Granted	180	17.37		242	19.35		246	21.49
Exercised	(102)	21.24		(40)	11.47		(54)	16.48
Forfeited or Expired	(273)	32.09		(142)	31.36		(2)	36.08
Outstanding at end of period	488	$	22.03	683	$	27.15	623	$	30.14
Exercisable	179	$	27.35	318	$	33.01	254	$	29.36
Unvested	309	$	18.94	365	$	22.04	369	$	30.68

Schedule of Unvested Restricted Shares

The following is a summary of the Company’s unvested time-based restricted shares:

	For the Year Ended December 31,
In thousands, except per share amounts	2020			2019			2018
Outstanding Time-Restricted Shares	Shares	Weighted-Average Grant-Date Fair Value		Shares	Weighted-Average Grant-Date Fair Value		Shares	Weighted-Average Grant-Date Fair Value
Unvested at the beginning of the period	159	$	24.33	114	$	37.67	80	$	48.65
Granted	84	17.92		98	20.99		73	26.52
Vested	(37)	31.00		(23)	56.45		(31)	36.45
Forfeited or Expired	(29)	23.09		(30)	39.58		(8)	50.56
Unvested at the end of the period	177	$	20.11	159	$	24.33	114	$	37.67

The following is a summary of all of the Company’s unvested performance-restricted shares:

	For the Year Ended December 31,
In thousands, except per share amounts	2020			2019			2018
Outstanding Performance-Restricted Shares	Shares	Weighted-Average Grant-Date Fair Value		Shares	Weighted-Average Grant-Date Fair Value		Shares	Weighted-Average Grant-Date Fair Value
Unvested at the beginning of the period	129	$	28.36	190	$	36.63	139	$	42.53
Granted	70	19.05		60	20.90		99	24.22
Vested	—	—		—	—		(48)	27.96
Forfeited or Expired	(57)	33.47		(121)	37.71		—	—
Unvested at the end of the period	142	$	21.67	129	$	28.36	190	$	36.63

Schedule of Valuation Assumptions of Restricted Shares

The fair values of each performance-restricted share award that contains a market condition were estimated on the date of grant using a Monte Carlo simulation with the following weighted-average assumptions:

	For the Year Ended December 31,
	2020		2019		2018
Performance period	1/1/20-12/31/22		1/1/20-12/31/22		1/1/19 - 12/31/21
Compounded risk-free interest rate	0.9	%	1.5	%	2.7	%
Lookback term	2.7 years		3.2 years		3.1 years
Historical volatility	51	%	42	%	35	%
Peer group	S&P 600 Industrials Index		S&P 600 Industrials Index		S&P 600 Industrials Index
Expected dividend yield	—	%	—	%	—	%

These performance-restricted awards vest according to the Company's relative Total Shareholder Return ("rTSR") performance as compared to the peer group over the performance period, according to the following table, where rTSR is calculated as ending stock price less beginning stock price, plus reinvested dividends, divided by beginning stock price:

Performance Level	Percentile Ranking	Vesting Percentage of Award
Maximum	75th Percentile or Higher	150%
Target	50th Percentile	100%
Threshold	25th Percentile	50%
Below Threshold	Below the 25th Percentile	—%