Debt (Details) - USD ($) $ in Thousands			6 Months Ended
		Jan. 11, 2019	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Jun. 30, 2018
Debt Instrument [Line Items]
Short-term debt			$ 426,125		$ 205,000	$ 185,000
Long-term debt
Current maturities of long-term debt			66,678		21,589	13,700
Finance lease liability	[1]		16,990		0	0
Total Current Maturities of Long-term Debt			66,678		21,589	13,700
Long-term debt, less current maturities			1,007,012		496,187	435,580
Finance lease liability	[1]		21,940		0	0
Total Long-term Debt, Less: Current Maturities			1,007,012		496,187	435,580
Nonrecourse
Debt Instrument [Line Items]
Short-term debt	[2]		75,476		0	0
Long-term debt
Current maturities of long-term debt	[3]		8,903		4,842	2,922
Long-term debt, less current maturities	[3]		198,560		146,353	72,290
Recourse
Debt Instrument [Line Items]
Short-term debt			350,649		205,000	185,000
Long-term debt
Current maturities of long-term debt	[4]		40,785		16,747	10,778
Long-term debt, less current maturities	[4]		786,512		$ 349,834	$ 363,290
LTG | LIBOR | Term Loan
Long-term debt
Borrowings under all lines of credit			33,900
Debt periodic payments			600
Line of credit
Long-term debt
Credit facility, maximum borrowing capacity			1,628,400
Total available for borrowings under lines of credit			1,006,100
Line of credit | Revolving line of credit | Thompsons Limited | LTG | LIBOR
Long-term debt
Credit facility, maximum borrowing capacity				$ 183,400
Total available for borrowings under lines of credit			107,900
Notes payable | LTG | LIBOR | 5-year term loan
Long-term debt
Debt term		5 years
Term loan amount		$ 250,000
Payments of term loans			6,300
Notes payable | LTG | LIBOR | 7-year term loan
Long-term debt
Debt term		7 years
Term loan amount		$ 250,000
Payments of term loans			$ 6,300

[1] See Note 14, Leases, for additional information. June 30, 2019 balances include the former build-to-suit lease that was reclassed from other current liabilities and other long-term liabilities as a result of the new lease standard.

[2] In conjunction with the recent acquisition, the Company assumed Thompsons' revolving line of credit and a term loan with a syndicate of banks, which are non-recourse to the Company. The credit agreement provides the Company with a maximum availability of $183.4 million and had $107.9 million available for borrowing on this line of credit as of June 30, 2019. Any borrowings under the line of credit bear interest at variable rates, which are based on LIBOR or Bankers’ Acceptances plus an applicable spread. The maturity date for the revolving line of credit is June 26, 2023.

[3] In conjunction with the recent acquisition, the Company also assumed a term loan with a syndicate of banks. The term loan had a balance of $33.9 million at June 30, 2019. Interest rates for the term loans are based on LIBOR plus an applicable spread. Payments of $0.6 million are made on a quarterly basis.

[4] On January 11, 2019 the Company entered into 5-year term loan in the amount of $250 million and a 7-year term loan of $250 million. A portion of the term loans were used to pay down debt assumed in the LTG acquisition. Interest rates are based on LIBOR plus an applicable spread. Payments on the term loans will be made on a quarterly basis. As of June 30, 2019, $6.3 million has been paid on the 5-year term loan and $6.3 million has been paid on the 7-year term loan.