Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)		$ 163,052	$ 6,663	$ (6,486)
Adjustments to reconcile net income to net cash provided by (used by) operating activities:
Depreciation and amortization of continuing operations		52,406	50,721	32,973
Depreciation and amortization of discontinued operations		7,722	11,852	11,496
Amortization of debt issuance costs		4,296	4,168	1,754
Write-off of debt issuance costs		10,502	2,589	19,173
Total derivative mark-to-market loss (gain), net of cash settlements		(1,483)	2,563
Allowance for doubtful accounts		699	142	745
Share of net income from joint venture, net of cash dividends received		(1,284)	(2,232)	(3,672)
Loss (gain) on disposals of property, plant and equipment		(54)	288	(687)
Gain on disposal of discontinued operations, net of tax and cost to sell		(133,665)
Compensation expense from issuance of share-based awards		4,730	3,935	4,039
Deferred income taxes		(23,195)	(15,526)	(19,143)
Other		(545)	(122)
Changes in operating assets and liabilities:
Accounts receivable		(11,374)	(18,505)	(2,492)
Inventories		(10,278)	4,377	(1,843)
Other current assets		(1,389)	(522)	(79)
Other non-current assets		(3)	2,381	(559)
Accounts payable		4,118	7,633	(7,963)
Income taxes payable (receivable)		(124,389)	(217)	2,631
Other liabilities		316	9,164	3,441
Net cash provided by (used by) operating activities		(59,818)	69,352	33,328
Cash flows from investing activities:
Acquisition of property, plant and equipment		(43,722)	(43,820)	(38,553)
Proceeds from measurement period adjustments to previous acquisition			1,635
Proceeds from disposals of property, plant and equipment		646	839	2,995
Short term investment		(8,000)
Proceeds from sale of business, net of cash sold		371,436
Cash paid to acquire businesses, net of cash received		(38,434)		(628,281)
Capital contributions to joint venture				(1,999)
Proceeds from insurance claim		545	122
Net cash provided by (used by) investing activities		282,471	(41,224)	(665,838)
Cash flows from financing activities:
Debt issue costs paid		(8,650)	(3,952)	(35,189)
Dividends paid		(7,695)	(7,584)	(6,433)
Proceeds from long-term debt		322,000	44,000	885,000
Repayment of long-term debt		(314,313)	(55,000)	(401,438)
Proceeds from (repayments of) short-term debt, net		(4,211)	(456)	(84)
Proceeds from shares issued				173,052
Proceeds from exercise of stock options		3,110	2,832	2,041
Shares withheld to satisfy income tax withholding		(617)	(173)	(231)
Principal payments on capital leases		(3,875)	(4,148)	(5,098)
Net cash provided by (used by) financing activities		(14,251)	(24,481)	611,620
Effect of exchange rate changes on cash flows		1,639	(4,329)	(1,340)
Net change in cash and cash equivalents		210,041	(682)	(22,230)
Cash and cash equivalents at beginning of period (1)	[1]	14,405	15,087	37,317
Cash and cash equivalents at end of period (1)	[1]	224,446	14,405	15,087
Supplemental schedule of non-cash operating, investing and financing activities:
Dividends accrued for performance share units		192
Property, plant and equipment acquired with capital leases		1,436
Restructuring charges in other current and non-current liabilities		222	3,238	2,959
Supplemental disclosures:
Cash paid for interest		52,083	59,158	20,146
Cash paid for income taxes		$ 72,294	$ 889	$ 6,377

[1] (1) Cash and cash equivalents includes $8.1 million, $3.7 million, and $9.1 million of cash and cash equivalents that was included in current assets of discontinued operations as of December 31, 2016, 2015, and 2014, respectively.