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Principal amount of Convertible Notes.

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Repayments Of Debt Accrued Interest

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt 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, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow for financing costs associated with business combinations.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Change in the value of each type or class of stock classified as temporary equity during the period. The redemption requirement does not constitute an unconditional obligation that will be settled in a variable number of shares constituting a monetary value predominantly indexed to (a) a fixed monetary amount known at inception, (b) an amount inversely correlated with the residual value of the entity, or (c) an amount determined by reference to something other than the fair value of issuer's stock. Does not include mandatorily redeemable stock. The exception is if redemption is required upon liquidation or termination of the reporting entity.

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Subsequent events (Details)					1 Months Ended	12 Months Ended
Subsequent events (Details)	Feb. 17, 2017 USD ($) $ / shares	Jan. 20, 2017 USD ($)	Jan. 05, 2017 USD ($) shares	Apr. 04, 2016 shares	Jan. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Feb. 20, 2017
Subsequent Event [Line Items]
Reduction in borrowings						$ 714,565,000	$ 303,757,000	$ 480,102,000
Payments of financing costs						3,400,000
Transaction costs						$ 3,000,000
Convertible senior notes percentage						3.875%	3.875%	3.875%
Loss on extinguishment of debt						$ 19,261,000	$ 10,454,000	$ 0
Conversion of convertible notes, shares issued upon conversion \| shares				2,170,000		1,700,000	2,700,000	1,900,000
Reclassification of convertible notes to mezzanine equity						$ 1,824,000
Shares received from dealer counterparties \| shares						400,000
Maximum
Subsequent Event [Line Items]
Conversion of convertible notes, shares issued upon conversion \| shares						7,981,422
Subsequent Event
Subsequent Event [Line Items]
Share price (usd per share) \| $ / shares	$ 56.00
Initial payment	$ 1,000,000,000
Loss on extinguishment of debt					$ 5,200,000
Shares received from dealer counterparties \| shares					120,000
2017 Credit Agreement \| Subsequent Event
Subsequent Event [Line Items]
Convertible senior notes percentage									2.00%
Debt issuance, line of credit					$ 12,000,000
Leverage ratio, required		4.50
Maximum secured leverage ratio		3.50
Interest coverage ratio, required		3.50
2013 Credit Agreement \| Subsequent Event
Subsequent Event [Line Items]
Loss on extinguishment of debt					$ 400,000
Senior Notes \| 3.875% Convertible Senior Subordinated Notes due 2017
Subsequent Event [Line Items]
Convertible senior notes percentage						3.875%	3.875%
Convertible subordinated debt						$ 136,076,000	$ 399,641,000
Senior Notes \| 3.875% Convertible Senior Subordinated Notes due 2017 \| Subsequent Event
Subsequent Event [Line Items]
Reduction in borrowings			$ 93,200,000
Extinguishment of debt, amount			91,700,000
Principal amount of convertible notes			1,000
Repayments of accrued debt interest			$ 1,500,000
Conversion of convertible notes, shares issued upon conversion \| shares			930,000
Convertible subordinated debt			$ 44,300,000
Additional Paid in Capital
Subsequent Event [Line Items]
Reclassification of convertible notes to mezzanine equity						$ 1,824,000
Revolving Credit Facility \| 2017 Credit Agreement \| Subsequent Event
Subsequent Event [Line Items]
Debt, term		5 years
Maximum amount available for borrowing		$ 1,000,000,000
Term Loan \| 2017 Credit Agreement \| Subsequent Event
Subsequent Event [Line Items]
Maximum amount available for borrowing		$ 750,000,000
LIBOR \| 2017 Credit Agreement \| Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate		1.00%
LIBOR \| 2017 Credit Agreement \| Subsequent Event \| Minimum
Subsequent Event [Line Items]
Basis spread on variable rate		1.25%
LIBOR \| 2017 Credit Agreement \| Subsequent Event \| Maximum
Subsequent Event [Line Items]
Basis spread on variable rate		2.50%
Federal Funds \| 2017 Credit Agreement \| Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate		0.50%
Adjusted LIBOR \| 2017 Credit Agreement \| Subsequent Event \| Minimum
Subsequent Event [Line Items]
Basis spread on variable rate		0.25%
Adjusted LIBOR \| 2017 Credit Agreement \| Subsequent Event \| Maximum
Subsequent Event [Line Items]
Basis spread on variable rate		1.50%