Description of the business and recent developments: (Tables)

9 Months Ended

Sep. 30, 2021

Description of the business and recent developments:

Schedule of diluted weighted average shares

	Three Months Ended	Three Months Ended	Nine Months Ended	Nine Months Ended
	September 30, 2021	September 30, 2020	September 30, 2021	September 30, 2020
Weighted average common shares - basic	46,293,524	45,815,718	46,290,452	45,818,677
Dilutive effect of stock options	36,406	—	34,191	99,581
Dilutive effect of restricted stock	536,999	—	501,305	680,612
Weighted average common shares - diluted	46,866,929	45,815,718	46,825,948	46,598,870

Schedule of unvested and anti-dilutive shares

	Three Months	Three Months	Nine Months	Nine Months
	Ended	Ended	Ended	Ended
	September 30, 2021	September 30, 2020	September 30, 2021	September 30, 2020
Unvested shares of restricted common stock	1,371,217	1,472,572	1,371,217	1,472,572
Anti-dilutive options for common stock	43,648	87,214	42,531	24,453
Anti-dilutive shares of restricted common stock	827	925,866	133,468	191

Schedule of Stockholders' Deficit

The following details the changes in stockholders’ deficit for the three and nine months ended September 30, 2021 and September 30, 2020 (in thousands except share amounts):

						Accumulated
				Additional		Other				Total
	Common Stock			Paid-in		Comprehensive		Accumulated		Stockholders’
	Shares	Amount		Capital		Income (Loss)		Deficit		Equity (Deficit)
Balance at June 30, 2020	47,279,201	$	47	$	506,391	$	(12,906)	$	(729,082)	$	(235,550)
Forfeitures of shares granted to employees	(4,932)		—		—		—		—		—
Equity-based compensation	—		—		7,147		—		—		7,147
Foreign currency translation	—		—		—		5,408		—		5,408
Issuances of common stock	10,500		—		—		—		—		—
Exercises of options	4,134		—		185		—		—		185
Common stock purchases and retirement	(4,567)		—		(269)		—		—		(269)
Dividends paid	—		—		—		—		(32,657)		(32,657)
Net (loss)	—		—		—		—		(4,955)		(4,955)
Balance at September 30, 2020	47,284,336	$	47	$	513,454	$	(7,498)	$	(766,694)	$	(260,691)

						Accumulated
				Additional		Other				Total
	Common Stock			Paid-in		Comprehensive		Accumulated		Stockholders’
	Shares	Amount		Capital		Income (Loss)		Deficit		Equity (Deficit)
Balance at June 30, 2021	47,655,131	$	48	$	533,049	$	(4,740)	$	(864,498)	$	(336,141)
Forfeitures of shares granted to employees	(10,933)		—		—		—		—		—
Equity-based compensation	—		—		7,164		—		—		7,164
Foreign currency translation	—		—		—		(3,818)		—		(3,818)
Issuances of common stock	11,820		—		—		—		—		—
Exercises of options	7,258		—		362		—		—		362
Dividends paid	—		—		—		—		(37,654)		(37,654)
Net income	—		—		—		—		13,320		13,320
Balance at September 30, 2021	47,663,276	$	48	$	540,575	$	(8,558)	$	(888,832)	$	(356,767)

						Accumulated
				Additional		Other				Total
	Common Stock			Paid-in		Comprehensive		Accumulated		Stockholders’
	Shares	Amount		Capital		Income (Loss)		Deficit		Equity (Deficit)
Balance at December 31, 2019	46,840,434	$	47	$	493,178	$	(12,326)	$	(684,578)	$	(203,679)
Forfeitures of shares granted to employees	(42,212)		—		—		—		—		—
Equity-based compensation	—		—		19,371		—		—		19,371
Foreign currency translation	—		—		—		4,828		—		4,828
Issuances of common stock	465,530		—		—		—		—		—
Exercises of options	25,151		—		1,174		—		—		1,174
Common stock purchases and retirement	(4,567)		—		(269)		—		—		(269)
Dividends paid	—		—		—		—		(94,952)		(94,952)
Net income	—		—		—		—		12,836		12,836
Balance at September 30, 2020	47,284,336	$	47	$	513,454	$	(7,498)	$	(766,694)	$	(260,691)

						Accumulated
				Additional		Other				Total
	Common Stock			Paid-in		Comprehensive		Accumulated		Stockholders’
	Shares	Amount		Capital		Income (Loss)		Deficit		Equity (Deficit)
Balance at December 31, 2020	47,214,077	$	47	$	515,867	$	(1,306)	$	(807,774)	$	(293,166)
Forfeitures of shares granted to employees	(36,235)		—		—		—		—		—
Equity-based compensation	—		—		23,471		—		—		23,471
Foreign currency translation	—		—		—		(7,252)		—		(7,252)
Issuances of common stock	460,580		1		—		—		—		1
Exercises of options	24,854		—		1,237		—		—		1,237
Dividends paid	—		—		—		—		(110,736)		(110,736)
Net income	—		—		—		—		29,678		29,678
Balance at September 30, 2021	47,663,276	$	48	$	540,575	$	(8,558)	$	(888,832)	$	(356,767)

Schedule of lease cost

	Three Months		Three Months		Nine Months		Nine Months
	Ended		Ended		Ended		Ended
	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
Finance lease cost
Amortization of right-of-use assets	$	6,847	$	6,382	$	19,571	$	16,117
Interest expense on finance lease liabilities		4,977		4,804		14,888		13,794
Operating lease cost		4,572		4,269		13,660		12,860
Total lease costs	$	16,396	$	15,455	$	48,119	$	42,771

	Nine Months			Nine Months
	Ended			Ended
	September 30, 2021			September 30, 2020
Other lease information
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from finance leases	$	(12,694)		$	(14,150)
Operating cash flows from operating leases		(14,077)			(13,785)
Financing cash flows from finance leases		(16,826)			(19,392)
Right-of-use assets obtained in exchange for new finance lease liabilities		38,411			61,504
Right-of-use assets obtained in exchange for new operating lease liabilities		15,732			24,866
Weighted-average remaining lease term — finance leases (in years)		12.6			12.3
Weighted-average remaining lease term — operating leases (in years)		19.2			20.4
Weighted average discount rate — finance leases		9.3	%		10.5	%
Weighted average discount rate — operating leases		5.5	%		5.4	%

Schedule of future minimum payments under these operating lease and finance lease agreements

The future minimum payments under these operating lease and finance lease agreements are as follows (in thousands):

	Operating		Finance
For the twelve months ending September 30,	Leases		Leases
2022	$	17,802	$	35,675
2023		18,295		34,812
2024		17,243		34,997
2025		15,228		31,738
2026		13,116		26,829
Thereafter		115,788		248,490
Total minimum lease obligations		197,472		412,541
Less—amounts representing interest		(71,095)		(173,002)
Present value of minimum lease obligations		126,377		239,539
Current maturities		(11,312)		(16,685)
Lease obligations, net of current maturities	$	115,065	$	222,854

Schedule of impact on financial statement line items from adopting ASC 326

			Current-period
			Provision for		Write offs
	Beginning		Expected Credit		Charged Against		Ending
Description	Balance		Losses		Allowance		Balance
Allowance for credit losses (deducted from accounts receivable)
Three months ending September 30, 2021	$	1,673	$	1,340	$	(1,600)	$	1,413
Three months ending September 30, 2020	$	2,115	$	1,174	$	(1,085)	$	2,204
Nine months ending September 30, 2021	$	1,921	$	4,539	$	(5,047)	$	1,413
Nine months ending September 30, 2020	$	1,771	$	3,942	$	(3,509)	$	2,204