CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities
Net income	$ 49,515	$ 4,156	$ 25,366
Adjustments to reconcile net income to cash provided by operating activities
Depreciation and amortization	40,834	41,702	43,159
Unrealized foreign exchange gain (loss)	(2,347)	2,933	133
Amortization of debt issuance costs	3,378	5,157	3,752
Amortization of discount on bonds payable	3,963	4,142	4,093
Change in fair value of common stock warrants	6,112	28,364	(1,887)
Share-based compensation	14,494	2,033	632
Loss on disposals of property, plant and equipment	170	401	690
Deferred income taxes	7,849	2,188	(11,293)
Changes in operating assets and liabilities
Accounts receivable	12,630	(174)	(35,594)
Inventories	(2,377)	(45,415)	(16,192)
Accounts payable	1,968	(1,998)	(2,585)
Accrued taxes	14,666	540	(881)
Accrued expenses and other liabilities	113,042	35,364	3,442
Other assets	(6,041)	1,165	(11,376)
Other noncurrent liabilities	(140,098)	12,278	53,739
Interest due to related parties	(12,570)	(1,006)	(1,085)
Cash flows provided by operating activities	105,188	91,830	54,113
Cash flows from investing activities
Additions to property, plant and equipment	(19,175)	(23,201)	(23,527)
Receivables from related parties	(919)
Cash flows used in investing activities	(20,094)	(23,201)	(23,527)
Cash flows from financing activities
Increase (decrease) in short-term borrowings, net	(3,941)	7,890	8,177
Repayment of senior term loan facility	(30,000)
Proceeds from senior term loan facility			30,000
Proceeds from term loan facility	375,000
Repayment of secured floating rate notes	(375,000)	(50,000)	(50,000)
Proceeds from exercise of stock options			100
Proceeds from exercise of common stock warrants	34,503	34,503	34,503
Repayment of bonds	(34,503)	(34,503)	(34,503)
Debt issuance costs	(6,606)		(1,045)
Dividends paid on Series A redeemable convertible preferred stock	(17,316)	(13,747)	(13,786)
Dividends paid to noncontrolling interests	(4,800)	(4,200)	(3,600)
Cash flows used in financing activities	(62,663)	(60,057)	(30,154)
Effect of foreign exchange rate changes on cash	(2,425)	(3,205)	(2,522)
Net increase (decrease) in cash	20,006	5,367	(2,090)
Cash, cash equivalents, restricted cash and restricted cash equivalents, beginning of year	59,134	53,767	55,857
Cash, cash equivalents, restricted cash and restricted cash equivalents, end of year	79,140	59,134	53,767
Supplemental information
Cash paid for interest to related parties	36,753	32,274	34,951
Cash paid for interest to third parties	27,165	20,571	21,656
Cash paid for income taxes	16,589	19,724	27,987
Non-cash additions to property, plant and equipment	1,170	1,913	2,577
Non-cash conversion of Series A redeemable convertible preferred stock	131,036
Non-cash conversion of convertible notes	362,489
Non-cash conversion of common stock warrants	$ 28,996	7,298
Non-cash exercise of stock options		$ 2,752	$ 793