Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 474,745	$ 489,354
Accounts receivables, net	324,691	390,977
Inventories	188,573	204,008
Other current assets	14,868	23,080
Total current assets	1,002,877	1,107,419
Property, plant and equipment, net	661,626	580,142
Goodwill and intangible assets, net	26,784	14,163
Other assets	53,374	56,957
Total assets	1,744,661	1,758,681
Current liabilities:
Current portion of long-term debt	266	304
Accounts payable	18,277	16,496
Deferred revenue	57,539	76,112
Accrued and other current liabilities	98,128	114,227
Total current liabilities	174,210	207,139
Deferred tax liabilities	44,856	35,321
Other non-current liabilities	47,390	42,980
Total liabilities	$ 266,456	$ 285,440
Commitments and contingencies (Note 17)
Series A preferred stock, €0.01 par value, 52,976,000 shares authorized, issued and outstanding	$ 705	$ 705
Stockholders' equity:
Common stock, €0.01 par value, 745,120,000 shares authorized: 154,643,094 shares issued and 154,732,998 outstanding at 2015 and 154,571,229 shares issued and 154,327,383 shares outstanding at 2014	2,034	2,033
Additional paid-in capital	702,267	683,611
Retained earnings	554,159	545,357
Accumulated other comprehensive loss	(21,382)	(14,210)
Treasury stock (at cost), 270,096 at 2015 and 243,846 shares at 2014	(5,334)	(4,801)
Total stockholders' equity	1,231,744	1,211,990
Noncontrolling interest	245,756	260,546
Total equity	1,477,500	1,472,536
Total liabilities and equity	$ 1,744,661	$ 1,758,681