Supplemental Guarantor Condensed Consolidated Financial Statements - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operations:
Cash provided by (used in) operating activities	$ (16,136)	$ (66,865)	$ (19,413)
Cash flows from investing activities
Purchase of furniture, equipment and leasehold improvements	(5,611)	(5,731)	(5,889)
Proceeds from Life Insurance Policy	1,744	0	0
Proceeds from Divestiture of Businesses	0	45,448	0
Cash (used in) provided by investing activities	(3,867)	39,717	(5,889)
Cash flows from financing activities
Cash dividends paid on Class A non-voting and Class B voting common stock	(5,836)	(5,887)	(6,008)
Payments of Ordinary Dividends, Noncontrolling Interest	(2,448)	(5,740)	0
Issuance of Class A non-voting common stock	26	0	0
Payments for Repurchase of Common Stock	(7,464)	(3,935)	(8,250)
Payments Related to Tax Withholding for Share-based Compensation	(2,237)	(1,341)	(1,683)
Proceeds from Issuance of Long-term Debt	200,000
Repayments of Long-term Debt	(150,000)
Payments of Debt Issuance Costs	(1,297)	0	0
Redemption of senior secured notes	(150,000)	0	0
Redemption of senior secured notes	(27,500)	45,600	40,800
Cash provided by financing activities	3,244	28,697	24,859
Net (decrease) increase in cash and cash equivalents	(16,759)	1,549	(443)
Cash and cash equivalents, beginning of year	64,913	63,364	63,807
Cash and cash equivalents, end of year	48,154	64,913	63,364
Eliminations
Cash flows from operations:
Cash provided by (used in) operating activities	0	0	0
Cash flows from investing activities
Purchase of furniture, equipment and leasehold improvements	0	0	0
Proceeds from Life Insurance Policy	0
Proceeds from Divestiture of Businesses		0
Cash (used in) provided by investing activities	0	0	0
Cash flows from financing activities
Cash dividends paid on Class A non-voting and Class B voting common stock	0	0	0
Payments of Ordinary Dividends, Noncontrolling Interest	0	0
Issuance of Class A non-voting common stock	0
Payments for Repurchase of Common Stock	0	0	0
Payments Related to Tax Withholding for Share-based Compensation	0	0	0
Repayments of Long-term Debt	0
Payments of Debt Issuance Costs	0
Redemption of senior secured notes			0
Redemption of senior secured notes	0	0	0
Cash provided by financing activities	0	0	0
Net (decrease) increase in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of year	0	0	0
Cash and cash equivalents, end of year	0	0	0
Guarantor Subsidiaries
Cash flows from operations:
Cash provided by (used in) operating activities	(6,568)	7,698	1,029
Cash flows from investing activities
Purchase of furniture, equipment and leasehold improvements	0	0	0
Proceeds from Life Insurance Policy	0
Proceeds from Divestiture of Businesses		0
Cash (used in) provided by investing activities	0	0	0
Cash flows from financing activities
Cash dividends paid on Class A non-voting and Class B voting common stock	0	0	0
Payments of Ordinary Dividends, Noncontrolling Interest	0	0
Issuance of Class A non-voting common stock	0
Payments for Repurchase of Common Stock	0	0	0
Payments Related to Tax Withholding for Share-based Compensation	0	0	0
Proceeds from Issuance of Long-term Debt	0
Repayments of Long-term Debt	0
Payments of Debt Issuance Costs	0
Redemption of senior secured notes			0
Redemption of senior secured notes	0	0	0
Cash provided by financing activities	0	0	0
Net (decrease) increase in cash and cash equivalents	(6,568)	7,698	1,029
Cash and cash equivalents, beginning of year	10,284	2,586	1,557
Cash and cash equivalents, end of year	3,716	10,284	2,586
Non-Guarantor Subsidiaries
Cash flows from operations:
Cash provided by (used in) operating activities	16,411	(85,048)	(36,851)
Cash flows from investing activities
Purchase of furniture, equipment and leasehold improvements	(5,611)	(5,731)	(5,889)
Proceeds from Life Insurance Policy	1,744
Proceeds from Divestiture of Businesses		45,448
Cash (used in) provided by investing activities	(3,867)	39,717	(5,889)
Cash flows from financing activities
Cash dividends paid on Class A non-voting and Class B voting common stock	0	0	0
Payments of Ordinary Dividends, Noncontrolling Interest	(2,448)	(5,740)
Issuance of Class A non-voting common stock	0
Payments for Repurchase of Common Stock	0	0	0
Payments Related to Tax Withholding for Share-based Compensation	0	0	0
Proceeds from Issuance of Long-term Debt	0
Repayments of Long-term Debt	0
Payments of Debt Issuance Costs	0
Redemption of senior secured notes			0
Redemption of senior secured notes	(27,500)	45,600	40,800
Cash provided by financing activities	(29,948)	39,860	40,800
Net (decrease) increase in cash and cash equivalents	(17,404)	(5,471)	(1,940)
Cash and cash equivalents, beginning of year	54,400	59,871	61,811
Cash and cash equivalents, end of year	36,996	54,400	59,871
Eliminations
Cash flows from financing activities
Proceeds from Issuance of Long-term Debt	0
Parent Company [Member]
Cash flows from investing activities
Proceeds from Life Insurance Policy	0
Proceeds from Divestiture of Businesses		0
Cash flows from financing activities
Payments of Ordinary Dividends, Noncontrolling Interest		0
Proceeds from Issuance of Long-term Debt	200,000
Parent
Cash flows from operations:
Cash provided by (used in) operating activities	(25,979)	10,485	16,409
Cash flows from investing activities
Purchase of furniture, equipment and leasehold improvements	0	0	0
Cash (used in) provided by investing activities	0	0	0
Cash flows from financing activities
Cash dividends paid on Class A non-voting and Class B voting common stock	(5,836)	(5,887)	(6,008)
Payments of Ordinary Dividends, Noncontrolling Interest	0
Issuance of Class A non-voting common stock	26
Payments for Repurchase of Common Stock	(7,464)	(3,935)	(8,250)
Payments Related to Tax Withholding for Share-based Compensation	(2,237)	(1,341)	(1,683)
Repayments of Long-term Debt	(150,000)
Payments of Debt Issuance Costs	(1,297)
Redemption of senior secured notes			0
Redemption of senior secured notes	0	0	0
Cash provided by financing activities	33,192	(11,163)	(15,941)
Net (decrease) increase in cash and cash equivalents	7,213	(678)	468
Cash and cash equivalents, beginning of year	229	907	439
Cash and cash equivalents, end of year	$ 7,442	$ 229	$ 907