Revenue - ASC 606 - Cumulative effect and consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets
Accounts receivable, net	$ 96,507	$ 86,011	$ 79,881
Inventories	1,486,736	1,410,773	1,415,915
Prepaid expenses and other assets	46,841	37,229	32,721
Deferred tax assets, net	147,077	155,248	155,551
Liabilities
Accrued liabilities	150,617	102,950	101,929
Deferred revenues and gains, current	82,433	78,526	77,669
Deferred revenues and gains, non-current	68,047	63,590	64,061
Stockholders' equity:
Retained earnings	27,387	7,502	6,192
Non-controlling interests	47,158	36,808	$ 34,332
Balances Without Adoption of ASC 606
Assets
Accounts receivable, net	90,551
Inventories	1,491,807
Prepaid expenses and other assets	41,873
Deferred tax assets, net	147,380
Liabilities
Accrued liabilities	149,570
Deferred revenues and gains, current	81,495
Deferred revenues and gains, non-current	68,662
Stockholders' equity:
Retained earnings	25,940
Non-controlling interests	44,425
Adjustment/Effect due to ASU 2014-09
Assets
Accounts receivable, net	5,956	6,130
Inventories	(5,071)	(5,142)
Prepaid expenses and other assets	4,968	4,508
Deferred tax assets, net	(303)	(303)
Liabilities
Accrued liabilities	1,047	1,021
Deferred revenues and gains, current	938	857
Deferred revenues and gains, non-current	(615)	(471)
Stockholders' equity:
Retained earnings	1,447	1,310
Non-controlling interests	$ 2,733	$ 2,476