Accounting Standards Adopted and Newly Issued Accounting Standards Not Yet Adopted - Adoption of ASC 606 on impacted Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets:
Receivables, net	$ 94,296	$ 140,188
Prepaid income taxes	42,398	45,981
Long-term receivables, net	120,541	126,570
Liabilities:
Deferred franchise revenue (short-term)	10,641	11,001
Other accrued expenses	19,540	16,001
Deferred franchise revenue, long-term	65,920	70,432
Other non-current liabilities	20,461	18,071
Deferred income taxes, net	113,320	119,996
Equity:
Accumulated deficit	$ (16,567)	(69,940)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Assets:
Receivables, net		150,174
Prepaid income taxes		43,654
Long-term receivables, net		131,212
Liabilities:
Deferred franchise revenue (short-term)		0
Other accrued expenses		17,780
Deferred franchise revenue, long-term		0
Other non-current liabilities		23,003
Deferred income taxes, net		138,177
Equity:
Accumulated deficit		(1,098)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09
Assets:
Receivables, net		(9,986)
Prepaid income taxes		2,327
Long-term receivables, net		(4,642)
Liabilities:
Deferred franchise revenue (short-term)		11,001
Other accrued expenses		(1,779)
Deferred franchise revenue, long-term		70,432
Other non-current liabilities		(4,932)
Deferred income taxes, net		(18,181)
Equity:
Accumulated deficit		$ (68,842)