Guarantor Subsidiaries Financial Information - Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ (13,703)	$ 213,976
Net cash used in investing activities	(128,581)	(40,202)
Net cash provided by (used in) financing activities	41,590	(102,157)
Effect of changes in currency exchange rates	30,732	5,127
(Decrease) Increase in cash	(69,962)	76,744
Cash, beginning of period	398,484	226,191
Cash, end of period	328,522	302,935
Elimination
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(16,093)	14,008
Net cash used in investing activities	0	0
Net cash provided by (used in) financing activities	16,093	(14,008)
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 in) provided by operating activities	(3,939)	(29,564)
Net cash used in investing activities	(8,661)	(5,445)
Net cash provided by (used in) financing activities	12,268	41,157
Effect of changes in currency exchange rates	0	0
(Decrease) Increase in cash	(332)	6,148
Cash, beginning of period	2,522	0
Cash, end of period	2,190	6,148
Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	63,758	139,189
Net cash used in investing activities	(105,498)	(19,799)
Net cash provided by (used in) financing activities	41,229	(118,345)
Effect of changes in currency exchange rates	0	0
(Decrease) Increase in cash	(511)	1,045
Cash, beginning of period	9,496	13,157
Cash, end of period	8,985	14,202
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(57,429)	90,343
Net cash used in investing activities	(14,422)	(14,958)
Net cash provided by (used in) financing activities	(28,000)	(10,961)
Effect of changes in currency exchange rates	30,732	5,127
(Decrease) Increase in cash	(69,119)	69,551
Cash, beginning of period	386,466	213,034
Cash, end of period	$ 317,347	$ 282,585

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

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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) of financing activities, excluding 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) of investing activities, excluding 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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