Schedule I - Condensed Financial Information of Registrant (Details Textual)					1 Months Ended					12 Months Ended			47 Months Ended
	Jan. 31, 2024 USD ($) $ / shares	Jan. 22, 2024 USD ($) shares	Jan. 09, 2024 USD ($)	Jan. 04, 2024 USD ($) $ / shares	Jan. 31, 2024 USD ($) $ / shares	May 31, 2021 USD ($) shares	Feb. 28, 2019 USD ($) $ / shares shares	Feb. 28, 2018 USD ($) $ / shares	Nov. 30, 2015 USD ($)	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 31, 2016 USD ($)	Oct. 01, 2023 shares	Jun. 29, 2023 USD ($)	Jan. 31, 2023 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2020 USD ($)	Feb. 01, 2019 USD ($)	Jan. 31, 2013 USD ($)
Long-Term Investments										$ 16,082,000	$ 28,080,000
Equity, Attributable to Parent										1,389,219,000	1,561,648,000	$ 1,685,126,000						$ 1,671,551,000
Goodwill										598,260,000	595,851,000
Intangible Assets, Net (Excluding Goodwill)										740,283,000	823,520,000
Debt Conversion, Converted Instrument, Amount										0	0	68,775,000
Gain (Loss) on Conversion of Debt										(0)	(0)	(11,111,000)
Line of Credit Facility, Maximum Borrowing Capacity										80,367,000
Long-Term Debt										249,345,000	256,251,000
Retained Earnings [Member]
Equity, Attributable to Parent										(2,011,786,000)	(1,822,923,000)	(1,511,976,000)						(1,481,833,000)
Additional Paid-in Capital [Member]
Equity, Attributable to Parent										3,433,006,000	3,421,872,000	3,222,487,000						$ 3,152,694,000
Senior Notes [Member]
Long-Term Debt										143,250,000	142,096,000
Convertible Senior Notes Due 2025 [Member] | Convertible Debt [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount		$ 200,000,000
Debt Instrument, Convertible Debt, Maximum Shares Issuable (in shares) | shares		30,000,000
Debt Instrument, Convertible Debt, Increase (Decrease) in Maximum Shares Issuable (in shares) | shares		8,313,000
The 2025 Notes [Member]
Long-Term Debt										$ 143,250,000	$ 142,096,000
The 2025 Notes [Member] | Convertible Debt [Member]
Debt Instrument, Face Amount							$ 200,000,000
Debt Instrument, Interest Rate, Stated Percentage							4.50%
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares							$ 4.22
Debt Instrument, Convertible Debt, Maximum Shares Issuable (in shares) | shares							30,000,000
Debt Instrument, Convertible Debt, Increase (Decrease) in Maximum Shares Issuable (in shares) | shares						8,105,175
Debt Conversion, Converted Instrument, Shares Outstanding (in shares) | shares										21,144,825	21,144,825
Proceeds From Convertible Debt, Conversion Fee							$ 300,000
Debt Instrument, Convertible, Conversion Ratio							236.7424
The 2025 Notes [Member] | Convertible Debt [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount			$ 170,000
Debt Instrument, Repurchase Amount			144,400,000	$ 144,400,000
The 2025 Notes [Member] | Convertible Debt [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument, Convertible, Threshold Trading Days							20
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger							130.00%
Debt Instrument, Convertible, Threshold Consecutive Trading Days							30
Debt Instrument, Redemption Price, Percentage							100.00%
The 2025 Notes [Member] | Convertible Debt [Member] | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument, Convertible, Threshold Trading Days							5
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger							98.00%
Debt Instrument, Convertible, Threshold Consecutive Trading Days							5
The 2025 Notes [Member] | Convertible Debt [Member] | Debt Instrument, Redemption, Period Three [Member]
Debt Instrument, Convertible, Threshold Trading Days							20
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger							130.00%
Debt Instrument, Convertible, Threshold Consecutive Trading Days							30
Debt Instrument, Redemption Price, Percentage							100.00%
The 2029 Convertible Notes [Member] | Convertible Debt [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount	$ 230,000,000			71,100,000	$ 230,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.75%				3.75%
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares	$ 1.15				$ 1.15
Cash Used or Repurchase of Notes				$ 146,300,000
Debt Instrument, Aggregate Principle Amount Purchased on Closing Date					$ 30,000,000
Proceeds from Issuance of Debt	$ 222,000,000,000		146,300,000
Payments for Repurchase of Common Stock	50,000,000
Share Price (in dollars per share) | $ / shares				$ 0.9067
Debt Instrument, Convertible, Conversion Ratio					869.5652
The 2029 Convertible Notes [Member] | Convertible Debt [Member] | Debt Instrument, Redemption, Period One [Member] | Subsequent Event [Member]
Debt Instrument, Convertible, Threshold Trading Days					20
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger					130.00%
Debt Instrument, Convertible, Threshold Consecutive Trading Days					30
Debt Instrument, Redemption Price, Percentage					100.00%
The 2029 Convertible Notes [Member] | Convertible Debt [Member] | Debt Instrument, Redemption, Period Two [Member] | Subsequent Event [Member]
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger					98.00%
The 2023 Convertible Notes [Member]
Long-Term Debt										$ 71,025,000	$ 68,275,000
The 2023 Convertible Notes [Member] | Convertible Debt [Member]
Debt Instrument, Face Amount								$ 55,000,000
Debt Instrument, Interest Rate, Stated Percentage								5.00%
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares								$ 5
Debt Instrument, Convertible, Conversion Premium, Percent								25.00%
Debt Instrument, Convertible, Conversion Premium, Per Share (in dollars per share) | $ / shares								$ 1.66
The 2023 Convertible Notes [Member] | Convertible Debt [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount			55,000,000	$ 55,000,000
Interest Payable			16,100,000	16,100,000
Long-Term Debt				$ 0
The 2033 Senior Notes [Member]
Long-Term Debt										50,000	3,050,000
The 2033 Senior Notes [Member] | Convertible Debt [Member]
Debt Conversion, Converted Instrument, Amount													$ 143,200,000
Debt Instrument, Repurchase Amount																			$ 28,800,000
Long-Term Debt										50,600
The 2033 Senior Notes [Member] | Senior Notes [Member]
Debt Instrument, Face Amount																$ 175,000,000
Debt Instrument, Interest Rate, Stated Percentage																				3.00%
Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity									$ 75,000,000						$ 50,000,000
Line of Credit Facility, Remaining Borrowing Capacity										7,500,000
Long-Term Line of Credit, Noncurrent										$ 12,700,000	18,100,000
Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Quarterly Availability is 50% or More [Member]
Line of Credit Facility, Commitment Fee Percentage										1.00%
Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate 12 Months [Member] | Quarterly Availability is 50% or More [Member]
Debt Instrument, Basis Spread on Variable Rate										0.10%
Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate										2.00%
Debt Instrument, Basis Spread on Variable Rate, Benchmark Adjustment										0.10%
Credit Agreement [Member] | Line of Credit [Member] | Bridge Loan [Member]
Line of Credit Facility, Maximum Borrowing Capacity									20,000,000
Credit Agreement [Member] | Line of Credit [Member] | Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity									20,000,000
BioReference [Member]
Equity, Attributable to Parent										$ 488,300,000
Goodwill										283,000,000
Intangible Assets, Net (Excluding Goodwill)										167,800,000
Parent Company [Member]
Long-Term Investments										1,577,938,000	1,665,355,000
Gain (Loss) on Conversion of Debt										(0)	(0)	$ (11,111,000)
Equity, Including Portion Attributable to Noncontrolling Interest										1,389,218,000	1,561,648,000
Payments of Dividends										0	33,000,000
Parent Company [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Equity, Including Portion Attributable to Noncontrolling Interest																	$ 21,600,000
Parent Company [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Equity, Including Portion Attributable to Noncontrolling Interest																	17,500,000
Parent Company [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Additional Paid-in Capital [Member]
Equity, Including Portion Attributable to Noncontrolling Interest																	$ 39,100,000
Parent Company [Member] | Subsequent Event [Member]
Share Price (in dollars per share) | $ / shares				$ 0.9067
Parent Company [Member] | Senior Notes [Member]
Long-Term Debt										$ 143,250,000	142,096,000
Parent Company [Member] | Convertible Senior Notes Due 2025 [Member] | Convertible Debt [Member]
Debt Instrument, Face Amount							$ 200,000,000
Debt Instrument, Interest Rate, Stated Percentage							4.50%
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares							$ 4.22
Debt Instrument, Redemption Price, Percentage							100.00%
Debt Conversion, Converted Instrument, Amount						$ 55,400,000
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares						19,051,270
Gain (Loss) on Conversion of Debt						$ (11,100,000)
Debt Instrument, Convertible Debt, Maximum Shares Issuable (in shares) | shares							30,000,000
Debt Instrument, Convertible Debt, Increase (Decrease) in Maximum Shares Issuable (in shares) | shares						8,105,175
Debt Conversion, Converted Instrument, Shares Outstanding (in shares) | shares										21,144,825				21,144,825
Proceeds From Convertible Debt, Conversion Fee										$ 300,000
Parent Company [Member] | Convertible Senior Notes Due 2025 [Member] | Convertible Debt [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger							130.00%
Parent Company [Member] | Convertible Senior Notes Due 2025 [Member] | Convertible Debt [Member] | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger							98.00%
Parent Company [Member] | Convertible Senior Notes Due 2025 [Member] | Convertible Debt [Member] | Debt Instrument, Redemption, Period Three [Member]
Debt Instrument, Convertible, Threshold Trading Days										20
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger										130.00%
Debt Instrument, Convertible, Threshold Consecutive Trading Days										30
Debt Instrument, Redemption Price, Percentage										100.00%
Parent Company [Member] | Convertible Senior Notes Due 2025 [Member] | Convertible Debt [Member] | Minimum [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument, Convertible, Threshold Trading Days							20
Parent Company [Member] | Convertible Senior Notes Due 2025 [Member] | Convertible Debt [Member] | Minimum [Member] | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument, Convertible, Threshold Trading Days							5
Parent Company [Member] | Convertible Senior Notes Due 2025 [Member] | Convertible Debt [Member] | Maximum [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument, Convertible, Threshold Trading Days							30
Parent Company [Member] | Convertible Senior Notes Due 2025 [Member] | Convertible Debt [Member] | Maximum [Member] | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument, Convertible, Threshold Consecutive Trading Days							5
Parent Company [Member] | The 2029 Notes [Member] | Convertible Debt [Member] | Subsequent Event [Member]
Debt Conversion, Converted Instrument, Amount			144,400,000
Cash Used or Repurchase of Notes			146,300,000
Parent Company [Member] | The 2025 Notes [Member] | Convertible Debt [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount		$ 200,000,000
Debt Conversion, Converted Instrument, Amount			170,000,000
Cash Used or Repurchase of Notes				$ 146,300,000
Debt Instrument, Convertible Debt, Maximum Shares Issuable (in shares) | shares		30,000,000
Debt Instrument, Convertible Debt, Increase (Decrease) in Maximum Shares Issuable (in shares) | shares		8,313,000
Debt Instrument, Repurchase Amount				144,400,000
Parent Company [Member] | A5 Convertible Notes [Member] | Convertible Debt [Member]
Debt Instrument, Face Amount								$ 55,000,000
Debt Instrument, Interest Rate, Stated Percentage								5.00%
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares								$ 5
Debt Instrument, Convertible, Conversion Premium, Percent								25.00%
Debt Instrument, Convertible, Conversion Premium, Per Share (in dollars per share) | $ / shares								$ 1.66
Parent Company [Member] | The 2029 Convertible Notes [Member] | Convertible Debt [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount	$ 230,000,000		71,100,000	$ 71,100,000	$ 230,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.75%				3.75%
Debt Instrument, Convertible, Threshold Trading Days				20
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger				130.00%	98.00%
Debt Instrument, Convertible, Threshold Consecutive Trading Days				30
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares	$ 1.15				$ 1.15
Debt Instrument, Redemption Price, Percentage					100.00%
Debt Instrument, Aggregate Principle Amount Purchased on Closing Date					$ 30,000,000
Proceeds from Issuance of Debt	$ 222,000,000
Payments for Repurchase of Common Stock	$ 50,000,000
Debt Instrument, Convertible, Conversion Ratio					869.5652
Parent Company [Member] | The 2023 Convertible Notes [Member] | Convertible Debt [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount			55,000,000	$ 55,000,000
Debt Instrument, Unpaid Accrued Interest			16,100,000
Debt Instrument, Outstanding Convertible Notes			$ 0
Interest Payable				16,100,000
Long-Term Debt				$ 0
Parent Company [Member] | The 2033 Senior Notes [Member] | Senior Notes [Member]
Debt Instrument, Face Amount																				$ 175,000,000
Debt Instrument, Interest Rate, Stated Percentage																3.00%				3.00%
Debt Conversion, Converted Instrument, Amount													$ 143,200,000
Debt Instrument, Outstanding Convertible Notes										$ 50,600,000
Debt Instrument, Repurchase Amount																			$ 28,800,000
Repayments of Convertible Debt										3,000,000
Parent Company [Member] | New Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity									$ 75,000,000
Long-Term Line of Credit, Noncurrent										12,700,000	$ 18,100,000
Parent Company [Member] | New Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate 12 Months [Member] | Quarterly Availability is 50% or More [Member]
Debt Instrument, Basis Spread on Variable Rate									2.50%
Parent Company [Member] | New Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate									2.00%
Debt Instrument, Basis Spread on Variable Rate, Benchmark Adjustment									0.10%
Parent Company [Member] | New Credit Agreement [Member] | Line of Credit [Member] | Bridge Loan [Member]
Line of Credit Facility, Maximum Borrowing Capacity									$ 20,000,000
Parent Company [Member] | New Credit Agreement [Member] | Line of Credit [Member] | Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity									20,000,000
Parent Company [Member] | Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity									$ 75,000,000						$ 50,000,000
Line of Credit Facility, Remaining Borrowing Capacity										7,500,000
Parent Company [Member] | Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Quarterly Availability is 50% or More [Member]
Line of Credit Facility, Commitment Fee Percentage									0.40%
Parent Company [Member] | Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Quarterly Availability is Less Than 50 [Member]
Line of Credit Facility, Commitment Fee Percentage									0.275%
Parent Company [Member] | Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate 12 Months [Member] | Quarterly Availability is 50% or More [Member]
Debt Instrument, Basis Spread on Variable Rate									0.10%
Parent Company [Member] | Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Line of Credit Facility, Commitment Fee Percentage									1.00%
Parent Company [Member] | BioReference [Member]
Equity, Attributable to Parent										488,300,000
Goodwill										283,000,000
Intangible Assets, Net (Excluding Goodwill)										$ 167,800,000
Restricted Investments, Percent of Net Assets										25.00%
Restricted Net Assets										$ 1,400,000,000