Equity-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement, Noncash Expense [Abstract]

Summary of Compensation Expense Connection with Awards

The Company recognized the following compensation expense in connection with awards that vested under the 2018 Plan, the 2015 Plan, the Prior Plan, and the Non-Employee Directors Plan along with the related tax benefits recognized during the years ended December 31 (in thousands):

	2019		2018		2017
Expense recognized under the Prior Plan	$	192	$	569	$	1,059
Expense recognized under the 2015 Plan	5,077		7,988		5,643
Expense recognized under the 2018 Plan	6,731		188		—
Expense recognized under the Non-Employee Directors Plan	570		444		420
Total stock compensation expense	$	12,570	$	9,189	$	7,122
Tax benefits recognized related to stock compensation expense	$	3,136	$	2,509	$	2,133

Schedule of Number of Awards and Weighted Average Grant Date Fair Value

The following table provides the number of stock options, stock units, and common stock granted during the years ended December 31, along with the weighted-average grant-date fair value of each award:

	2019			2018			2017
Awards	Number of Awards	Weighted Average Grant Date Fair Value		Number of Awards	Weighted Average Grant Date Fair Value		Number of Awards	Weighted Average Grant Date Fair Value
Options	—	$	—	—	$	—	25,000	$	12.85
Deferred stock units	7,509	$	37.95	10,255	$	35.96	10,170	$	34.42
Common stock	7,509	$	37.95	2,113	$	35.50	2,034	$	34.42
Restricted stock units	152,472	$	39.73	116,174	$	36.61	133,548	$	36.56
Performance stock units	183,908	$	40.49	135,929	$	33.63	108,748	$	42.72

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following table provides the weighted average assumptions used to value stock options issued during the year ended December 31:

Year of Grant	Fair Value		Expected Life (in years)	Expected Stock Volatility		Risk-free Interest Rate		Expected Dividend Yield
2017	$	12.85	4.00	35.7	%	1.7	%	—	%

Summary of Ranges of Outstanding and Exercisable Options

The following table summarizes the ranges of outstanding and exercisable options at December 31, 2019:

Range of Exercise Prices	Options Outstanding	Weighted Average Remaining Contractual Life (in years)	Weighted Average Exercise Price		Options Exercisable	Weighted Average Exercise Price
$8.90 – $9.50	15,938	0.71	$	8.90	15,938	$	8.90
$9.51 – $24.00	51,471	1.71	$	9.74	51,471	$	9.74
$24.01 – $25.50	25,000	6.01	$	25.44	25,000	$	25.44
$25.51 - $43.05	25,000	7.13	$	42.35	—	$	—
	117,409				92,409

Summary of Stock Options Transactions

The following table summarizes information about stock option transactions:

	Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value
Balance at January 1, 2017	277,224		$	14.95
Granted	25,000		42.35
Exercised	(42,058	)	16.02
Forfeited	(12,500	)	25.44
Balance at December 31, 2017	247,666		$	17.01
Exercised	(87,907	)	15.75
Balance at December 31, 2018	159,759		$	17.70
Exercised	(42,350	)	11.57
Balance at December 31, 2019	117,409		$	19.91	3.64	$	3,584,000

Summary of Information About Restricted Stock Units and Weighted Average Grant Date Fair Value

The following table summarizes information about non-vested restricted stock units, performance stock units (that will convert to shares upon vesting) and common stock:

	Restricted Stock Units		Weighted Average Grant Date Fair Value		Common Stock		Weighted Average Grant Date Fair Value		Performance Stock Units (1)		Weighted Average Grant Date Fair Value		Deferred Stock Units (2)	Weighted Average Grant Date Fair Value
Balance at December 31, 2018	395,353		$	27.61	—		$	—	235,485		$	33.78	27,243	$	33.18
Granted	152,972		39.73		7,509		37.95		194,658		40.49		7,509	37.95
Vested	(162,690	)	24.31		(7,509	)	37.95		(92,696	)	28.99		—	—
Forfeited	(11,203	)	35.72		—		—		(8,190	)	46.05		—	—
Balance at December 31, 2019	374,432		$	33.74	—		$	—	329,257		$	38.53	34,752	$	34.21

Aggregate Intrinsic Value of Options Exercised and Aggregate Fair Value of Restricted Stock Units and Restricted Shares that Vested

The following table sets forth the aggregate intrinsic value of options exercised and aggregate fair value of restricted stock units and restricted shares that vested during the years ended December 31 (in thousands):

	2019		2018		2017
Aggregate intrinsic value of options exercised	$	1,371	$	2,128	$	628
Aggregate fair value of vested restricted stock units	$	10,017	$	5,307	$	6,756
Aggregate fair value of vested common and restricted shares	$	285	$	149	$	70
Aggregate fair value of vested deferred stock units	$	285	$	369	$	350

Cash Paid to Settle Liability Awards

The following table provides the number of restricted stock units credited to active participant accounts, balance of vested and unvested restricted stock units within active participant accounts, payments made with respect to restricted stock units issued under the MSPP, and MSPP expense during years ended December 31:

	2019		2018		2017
Restricted stock units credited	61,369		66,843		84,299
Restricted stock units balance, vested and unvested	415,760		387,870		389,189
Share-based liabilities paid, in thousands	$	6,543	$	5,232	$	6,058
MSPP expense, in thousands	$	2,699	$	4,809	$	2,432