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Income Taxes (Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax expense at the statutory rate									$ (81,849)	$ (19,348)	$ (48,300)
State taxes, net of federal tax benefit									(2,564)	(294)	(1,425)
Non-U.S. operations									(10,166)	6,337	(5,791)
Domestic incentives									(286)	(254)	(170)
Prior year federal, non-U.S. and state tax									(2,880)	(1,283)	(777)
Nondeductible expenses									502	644	345
Goodwill impairment									46,051	14,731	0
Global Tubing acquisition									0	(9,160)	0
U.S. tax reform					$ 10,100				(15,604)	10,138	0
Valuation allowance	$ 50,000								50,005	4,523	0
Other									1,117	(1,913)	67
Provision (benefit) for income taxes	$ (3,308)	$ (1,108)	$ 1,646	$ (12,904)	$ 35,981	$ (7,817)	$ (11,070)	$ (12,973)	$ (15,674)	$ 4,121	$ (56,051)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax expense at the statutory rate									(21.00%)	(35.00%)	(35.00%)
State taxes, net of federal tax benefit									(0.70%)	(0.50%)	(1.00%)
Non-U.S. operations									(2.60%)	11.50%	(4.20%)
Domestic incentives									(0.10%)	(0.50%)	(0.10%)
Prior year federal, non-U.S. and state tax									(0.70%)	(2.30%)	(0.60%)
Nondeductible expenses									0.10%	1.20%	0.30%
Goodwill impairment									11.80%	26.60%	(0.00%)
Global Tubing acquisition									(0.00%)	(16.60%)	(0.00%)
U.S. tax reform									(4.00%)	18.30%	(0.00%)
Valuation allowance									12.80%	8.20%	(0.00%)
Other									0.40%	(3.40%)	(0.00%)
Income tax expense (benefit)									(4.00%)	7.50%	(40.60%)

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 13
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- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-SubTopic 10
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-Paragraph 13
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