Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Statements of Cash Flows) (Details) - USD ($) $ in Thousands		3 Months Ended											12 Months Ended
		Dec. 31, 2016		Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016		Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Operating Activities
Net income		$ 354	[1]	$ 3,917	$ 2,922	$ 2,224		$ 3,595	[1]	$ 328	$ 16,006	$ 3,102	$ 9,417	[2]	$ 23,031	[2]	$ 25,278	[2]
Adjustments to reconcile net income to net cash provided by operating activities:
Change in net deferred tax assets													(5,060)		(4,067)	[2]	(14,029)	[2]
Other reconciling adjustments													19,128		5,786		18,775
Net changes in operating assets and liabilities:
Deferred revenue and other liabilities													3,626		(745)	[2]	2,183	[2]
Other operating assets and liabilities													3,077		4,569		(3,864)
Net cash provided by operating activities													30,188		28,574	[2]	28,343	[2]
Investing Activities
Net cash used in investing activities													(42,861)		(29,710)	[2]	(9,898)	[2]
Financing Activities
Net cash provided by/(used in) financing activities													11,246		(27,961)	[2]	(3,275)	[2]
Effect of exchange rate on cash													742		(1,449)	[2]	(2,618)	[2]
Net increase (decrease) in cash and cash equivalents													(685)		(30,546)	[2]	12,552	[2]
Cash and cash equivalents at the beginning of the year	[2]					19,702	[3],[4]					50,248	19,702	[3],[4]	50,248		37,696
Cash and cash equivalents at the end of the year		19,017						19,702	[2],[3],[4]				19,017		19,702	[2],[3],[4]	50,248	[2]	$ 37,696	[2]
Without Breakage Revenue [Member]
Operating Activities
Net income													9,032
Adjustments to reconcile net income to net cash provided by operating activities:
Change in net deferred tax assets													(5,293)
Other reconciling adjustments													19,128
Net changes in operating assets and liabilities:
Deferred revenue and other liabilities													4,244
Other operating assets and liabilities													3,077
Net cash provided by operating activities													30,188
Investing Activities
Net cash used in investing activities													(42,861)
Financing Activities
Net cash provided by/(used in) financing activities													11,246
Effect of exchange rate on cash													742
Net increase (decrease) in cash and cash equivalents													(685)
Cash and cash equivalents at the beginning of the year						19,702							19,702
Cash and cash equivalents at the end of the year		$ 19,017						19,702					19,017		19,702
Previously Reported [Member]
Operating Activities
Net income															22,694		25,644
Adjustments to reconcile net income to net cash provided by operating activities:
Change in net deferred tax assets															(4,272)		(14,889)
Other reconciling adjustments															5,786		18,775
Net changes in operating assets and liabilities:
Deferred revenue and other liabilities															(203)		2,677
Other operating assets and liabilities															4,569		(3,864)
Net cash provided by operating activities															28,574		28,343
Investing Activities
Net cash used in investing activities															(29,710)		(9,898)
Financing Activities
Net cash provided by/(used in) financing activities															(27,961)		(3,275)
Effect of exchange rate on cash															(1,449)		(2,618)
Net increase (decrease) in cash and cash equivalents															(30,546)		12,552
Cash and cash equivalents at the beginning of the year						$ 19,702						$ 50,248	19,702		50,248		37,696
Cash and cash equivalents at the end of the year								$ 19,702							19,702		50,248		37,696
Adjustment [Member]
Operating Activities
Net income													385		337		(366)	[5]	$ 1,800
Adjustments to reconcile net income to net cash provided by operating activities:
Change in net deferred tax assets													233		205		860
Net changes in operating assets and liabilities:
Deferred revenue and other liabilities													$ (618)		$ (542)		$ (494)

[1] Fourth Quarter Results included the impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).

[2] Certain 2015 and 2014 balances included the restatement impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).

[3] Certain 2015 balances have been reclassified to conform to the 2016 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).

[4] Certain 2015 balances included the restatement impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).

[5] The income tax effect of $860,000 in 2014 relates to the cumulative breakage revenue as of December 31, 2014. The tax effect of the portion that relates to years prior to 2014 was not recognized until 2014 due to full valuation allowance on our deferred tax assets in the U.S. as of December 31, 2013 and prior.