Guarantor Subsidiaries Financial Information - Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net cash (used for) provided by operating activities	$ 26,511	$ 246,893
Net cash used for investing activities	(149,824)	(115,891)
Net cash provided by (used for) financing activities	(70,049)	(112,336)
Effect of changes in currency exchange rates	22,958	5,525
(Decrease) Increase in cash	(170,404)	24,191
Cash, beginning of period	398,484	226,191
Cash, end of period	228,080	250,382
Elimination
Condensed Financial Statements, Captions [Line Items]
Net cash (used for) provided by operating activities	(22,430)	(20,223)
Net cash used for investing activities	0	0
Net cash provided by (used for) financing activities	22,430	20,223
Effect of changes in currency exchange rates	0	0
(Decrease) Increase in cash	0	0
Cash, beginning of period	0	0
Cash, end of period	0	0
Parent
Condensed Financial Statements, Captions [Line Items]
Net cash (used for) provided by operating activities	(38,954)	(53,967)
Net cash used for investing activities	(12,591)	(5,067)
Net cash provided by (used for) financing activities	52,072	70,272
Effect of changes in currency exchange rates	0	0
(Decrease) Increase in cash	527	11,238
Cash, beginning of period	2,522	0
Cash, end of period	3,049	11,238
Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash (used for) provided by operating activities	115,816	220,963
Net cash used for investing activities	(110,741)	(26,693)
Net cash provided by (used for) financing activities	(8,489)	(193,669)
Effect of changes in currency exchange rates	0	0
(Decrease) Increase in cash	(3,414)	601
Cash, beginning of period	9,496	13,157
Cash, end of period	6,082	13,758
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash (used for) provided by operating activities	(27,921)	100,120
Net cash used for investing activities	(26,492)	(84,131)
Net cash provided by (used for) financing activities	(136,062)	(9,162)
Effect of changes in currency exchange rates	22,958	5,525
(Decrease) Increase in cash	(167,517)	12,352
Cash, beginning of period	386,466	213,034
Cash, end of period	$ 218,949	$ 225,386

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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