Total debt, net of debt issuance costs

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Gain (Loss) on Extinguishment of Debt, before Tax

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Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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The amount of subsequent adjustments to additional paid in capital for convertible financial instruments where a component of equity and a component of debt are recognized.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The price per share of the conversion feature embedded in the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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The average effective interest rate during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Date the credit facility terminates, in CCYY-MM-DD format.

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The effective interest rate at the end of the reporting period.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Debt Obligations (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	May 28, 2019	May 22, 2019	Mar. 18, 2019	Dec. 31, 2018	Oct. 30, 2014
Debt Instrument [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ 12,161,000		$ (58,533,000)	$ (4,024,000)	$ (35,585,000)
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt		$ 71,660,000
Repayments of Debt	49,000,000
Revolving Credit Facility	$ 6,129,000			$ 6,129,000					$ 215,725,000
Revolving Credit Facility, Interest Rate at Period End	2.23%			2.23%
Debt Instrument, Face Amount						$ 1,000
Debt Instrument, Convertible, Conversion Price	$ 147.24			$ 147.24
Repayments of Convertible Debt	$ 352,400,000	94,200,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	1.375%			1.375%
Other Debt	$ 24,279,000			$ 24,279,000					38,513,000
Debt, Long-term and Short-term, Combined Amount	1,142,051,000			1,142,051,000					634,097,000
Unamortized Debt Issuance Expense	21,318,000			21,318,000					6,298,000
Debt, net of debt issuance costs	1,120,733,000			1,120,733,000					627,799,000
Short-term debt obligations and current maturities of long-term debt obligations	23,998,000			23,998,000					38,017,000
Debt obligations, net of current portion	$ 1,096,735,000			1,096,735,000					589,782,000
Line of Credit Facility, Expiration Date	Oct. 17, 2023
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments		$ (42,917,000)
Stock Issued During Period, Shares, Conversion of Convertible Securities	2.5
Gain (Loss) on Extinguishment of Debt				(9,831,000)
Debt Securities	$ 682,080,000			682,080,000			$ 669,900,000
0.75% Issue [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								$ 525,000,000
Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.125%
Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.175%
Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
1.5% Issue [Member]
Debt Instrument [Line Items]
Convertible Debt	$ 0			0					$ 379,859,000
Debt Instrument, Convertible, Conversion Price										$ 72.18
Interest Expense, Debt				1,500,000
Amortization of Debt Discount (Premium)	1,800,000		$ 4,600,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments				34,200,000
0.75% Issue [Member]
Debt Instrument [Line Items]
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt				25,600,000
Convertible Debt	429,563,000			429,563,000
Debt Instrument, Convertible, Conversion Price								$ 188.73
Interest Expense, Debt	1,000,000.0			1,100,000
Amortization of Debt Discount (Premium)	$ 3,600,000			$ 4,200,000
Debt Instrument, Interest Rate During Period	4.40%			4.40%
Debt Instrument, Unamortized Discount	$ 95,400,000			$ 95,400,000