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Consolidated Statements of Shareholders' Equity (Unaudited) Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Dividends per share of common stock (in dollars per share)	$ 0.20	$ 0.20
Pension liability, tax	$ 173	$ 162
Cash flow hedging gain (loss), tax	34	505
Paid-in Capital
Convertible Note Discount Income Tax Expense (Benefit)	12,470	0
Convertible Note Hedge Income Tax Expense (Benefit)	$ (12,369)	$ 0

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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