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Stockholders' Equity and Equity Compensation Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2014
Stockholders Equity And Equity Compensation Plans [Line Items]
Remaining number of shares available for repurchase	3,900,000		3,900,000
Repurchase of common stock for employee tax withholdings, shares	2,000	4,000	115,000	163,000
Repurchase of common stock for tax withholdings, value	$ 100	$ 100	$ 5,500	$ 7,800
Cash dividends declared per common share	$ 0.25	$ 0.235
Cash dividend	$ 8,100	$ 7,800	$ 24,500	23,200
Stock warrants term					10 years
Stock warrants, exercise price	$ 26.68		$ 26.68		$ 26.68
Stock-based compensation expense			$ 15,304	14,088
Performance Shares
Stockholders Equity And Equity Compensation Plans [Line Items]
Performance based awards granted to executive management and certain key employees shares			100,000
Vesting maturity date			first quarter of 2023
Vesting period			2 years
Restricted common stock
Stockholders Equity And Equity Compensation Plans [Line Items]
Vesting period			4 years
Separation Agreement
Stockholders Equity And Equity Compensation Plans [Line Items]
Stock-based compensation expense	$ 4,900	$ 4,000	$ 15,300	$ 14,100
Comcast
Stockholders Equity And Equity Compensation Plans [Line Items]
Issuance of stock warrants					2,900,000
Stock warrants issued	1,000,000.0		1,000,000.0
Stock warrants vested			0
SEC Rule 10b5-1 Plan
Stockholders Equity And Equity Compensation Plans [Line Items]
Repurchase of common stock, shares	143,000	139,000	438,000	290,000
Total amount paid	$ 6,700	$ 5,500	$ 20,100	$ 12,300
Weighted-average price per share	$ 46.66	$ 39.93	$ 46.04	$ 42.55

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