Operations and Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			12 Months Ended
	Jun. 06, 2022	Jan. 29, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings per share:
Net income (loss)			$ (80,582)	$ 62,542	$ 9,517
Interest on Convertible Debt, Net of Tax			0	0	0
Net Income (Loss) Available to Common Stockholders, Diluted			$ (80,582)	$ 62,542	$ 9,517
Basic-weighted average shares outstanding (in shares)			30,040	29,162	28,581
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements			0	1,275	883
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants			0	506	0
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities			0	1,273	0
Effect of dilutive potential securities (in shares)			0	3,054	883
Diluted-weighted average shares outstanding (in shares)			30,040	32,216	29,464
Basic EPS (in dollars per share)			$ (2.68)	$ 2.14	$ 0.33
Diluted EPS (in dollars per share)			$ (2.68)	$ 1.94	$ 0.32
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			0	600	1,400
Operations and Significant Accounting Policies [Line Items]
Payments to redeem convertible notes			$ 275,000	$ 0	$ 0
Antidilutive securities excluded from computation of earnings per share			0	600	1,400
2.625 Percent Convertible Notes Due 2024 [Member] | Convertible Notes Payable [Member]
Operations and Significant Accounting Policies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.625%
Payments to redeem convertible notes	$ 275,000
Debt Instrument, Face Amount	$ 70,000	$ 345,000
Debt Instrument, Convertible, Conversion Price		$ 88.80
2.250 Percent Convertible Notes Due 2027 | Convertible Notes Payable [Member]
Operations and Significant Accounting Policies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Debt Instrument, Face Amount	$ 800,000
Debt Instrument, Convertible, Conversion Price	$ 145.33
Warrant | 2.625 Percent Convertible Notes Due 2024 [Member] | Convertible Notes Payable [Member]
Operations and Significant Accounting Policies [Line Items]
Option Indexed to Issuer's Equity, Strike Price		114.92
Warrant | 2.250 Percent Convertible Notes Due 2027 | Convertible Notes Payable [Member]
Operations and Significant Accounting Policies [Line Items]
Option Indexed to Issuer's Equity, Strike Price	251.53
Hedge Transaction | 2.625 Percent Convertible Notes Due 2024 [Member] | Convertible Notes Payable [Member]
Operations and Significant Accounting Policies [Line Items]
Option Indexed to Issuer's Equity, Strike Price		$ 114.92
Hedge Transaction | 2.250 Percent Convertible Notes Due 2027 | Convertible Notes Payable [Member]
Operations and Significant Accounting Policies [Line Items]
Option Indexed to Issuer's Equity, Strike Price	$ 251.53