Long-Term Debt (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended				0 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended				0 Months Ended	3 Months Ended			6 Months Ended		0 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended				6 Months Ended			6 Months Ended			6 Months Ended			6 Months Ended			0 Months Ended			0 Months Ended							0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]	Dec. 31, 2013 Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]	May 10, 2013 Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]	May 10, 2013 Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member]	May 15, 2014 Enova Line Of Credit [Member]	Jun. 30, 2014 Enova Line Of Credit [Member]	May 14, 2014 Enova Line Of Credit [Member]	May 14, 2014 Enova Multi-Currency Line Of Credit Up to $25 Million [Member]	Jun. 30, 2014 Variable Rate Senior Unsecured Note Due 2018 [Member]	Jun. 30, 2014 Variable Rate Senior Unsecured Note Due 2018 [Member]	Dec. 31, 2013 Variable Rate Senior Unsecured Note Due 2018 [Member]	Jun. 30, 2013 Variable Rate Senior Unsecured Note Due 2018 [Member]	May 10, 2013 Variable Rate Senior Unsecured Note Due 2018 [Member]	May 20, 2014 5.25% Convertible Senior Notes Due 2029 [Member]	Jun. 30, 2014 5.25% Convertible Senior Notes Due 2029 [Member]	Mar. 31, 2014 5.25% Convertible Senior Notes Due 2029 [Member]	Jun. 30, 2013 5.25% Convertible Senior Notes Due 2029 [Member]	Jun. 30, 2014 5.25% Convertible Senior Notes Due 2029 [Member]	Jun. 30, 2013 5.25% Convertible Senior Notes Due 2029 [Member]	May 15, 2013 5.75% $300 Million Senior Unsecured Notes	Jun. 30, 2014 5.75% $300 Million Senior Unsecured Notes	Jun. 30, 2014 9.75% $500 Million Senior Unsecured Notes Due 2021 [Member]	Jun. 30, 2014 9.75% $500 Million Senior Unsecured Notes Due 2021 [Member]	May 14, 2014 9.75% $500 Million Senior Unsecured Notes Due 2021 [Member]	Jun. 30, 2014 Enova Standby And Letter Of Credit [Member]	Jun. 30, 2014 Standby Letters Of Credit [Member]	Mar. 31, 2014 Standby Letters Of Credit [Member]	Jun. 30, 2014 Waiver And Amendment [Member]	Jun. 30, 2014 Waiver And Amendment [Member]	Jun. 30, 2014 6.09% Series A Senior Unsecured Notes Due 2016 [Member]	Dec. 31, 2013 6.09% Series A Senior Unsecured Notes Due 2016 [Member]	Jun. 30, 2013 6.09% Series A Senior Unsecured Notes Due 2016 [Member]	Jun. 30, 2014 7.26% Senior Unsecured Notes Due 2017 [Member]	Dec. 31, 2013 7.26% Senior Unsecured Notes Due 2017 [Member]	Jun. 30, 2013 7.26% Senior Unsecured Notes Due 2017 [Member]	Jun. 30, 2014 6.00% Series A Senior Unsecured Notes Due 2019 [Member]	Dec. 31, 2013 6.00% Series A Senior Unsecured Notes Due 2019 [Member]	Jun. 30, 2013 6.00% Series A Senior Unsecured Notes Due 2019 [Member]	Jun. 30, 2014 6.21%Series B Senior Unsecured Notes Due 2021 [Member]	Dec. 31, 2013 6.21%Series B Senior Unsecured Notes Due 2021 [Member]	Jun. 30, 2013 6.21%Series B Senior Unsecured Notes Due 2021 [Member]	Jun. 30, 2014 6.58% Series B Senior Unsecured Notes Due 2022 [Member]	Dec. 31, 2013 6.58% Series B Senior Unsecured Notes Due 2022 [Member]	Jun. 30, 2013 6.58% Series B Senior Unsecured Notes Due 2022 [Member]	May 10, 2013 Minimum Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]	May 15, 2014 Minimum Enova Line Of Credit [Member]	Jun. 30, 2014 Minimum 9.75% $500 Million Senior Unsecured Notes Due 2021 [Member]	May 10, 2013 Minimum LIBOR [Member] Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]	May 15, 2014 Minimum LIBOR [Member] Enova Line Of Credit [Member]	May 10, 2013 Minimum Agent's Base Rate [Member] Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]	May 15, 2014 Minimum Agent's Base Rate [Member] Enova Line Of Credit [Member]	May 10, 2013 Maximum Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]	May 15, 2014 Maximum Enova Line Of Credit [Member]	Jun. 30, 2014 Maximum 9.75% $500 Million Senior Unsecured Notes Due 2021 [Member]	May 10, 2013 Maximum LIBOR [Member] Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]	May 15, 2014 Maximum LIBOR [Member] Enova Line Of Credit [Member]	May 10, 2013 Maximum Agent's Base Rate [Member] Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]	May 15, 2014 Maximum Agent's Base Rate [Member] Enova Line Of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 280,000,000	$ 100,000,000.0			$ 75,000,000.0	$ 25,000,000.0
Debt Instrument, Face Amount														50,000,000	50,000,000			50,000,000.0							300,000,000		500,000,000	500,000,000	500,000,000
Debt Instrument, Carrying Amount																											493,900,000	493,900,000
Debt instrument basis spread on variable rate																																																					2.00%	2.50%	0.50%	1.50%				3.25%	3.75%	1.75%	2.75%
Commitment fee, percentage						0.38%																																												0.25%	0.25%						0.50%	0.50%
Weighted average interest rate							3.30%
Debt instrument, maturity year															2018																				2016			2017			2019			2021			2022
Debt instrument, maturity date																									May 15, 2018
Debt Issuance Costs											1,600,000															8,700,000.0		14,700,000
Debt Instrument, Issuance Date										May 14, 2014															May 15, 2013
Debt instrument, interest rate																				5.25%			5.25%		5.75%		9.75%	9.75%	9.75%						6.09%			7.26%			6.00%			6.21%			6.58%
Percentage of Notes Principal Redeemable																											35.00%	35.00%
Note Redeem Rate																									100.00%		103.00%	103.00%																								100.00%							109.75%
Note Repurchase Rate																									101.00%		101.00%	101.00%
Issurance Cost Amortization Period, in years										37 months															5 years			seven years
Aggregate principal amount of convertible senior notes																				115,000,000			115,000,000
Debt Instrument, Repurchased Face Amount																					58,600,000
Repayments of Long-term Debt																			44,400,000		89,500,000												106,200,000
Gains (Losses) on Extinguishment of Debt	15,016,000	0	16,562,000	0										100,000							(1,500,000)
Long-term Debt	793,863,000	569,824,000	793,863,000	569,824,000	739,989,000									0	0	33,333,000	37,500,000																		0	21,000,000	28,000,000	0	20,000,000	20,000,000	0	47,000,000	47,000,000	0	18,182,000	20,455,000	0	5,000,000	5,000,000
Debt Instrument, Unamortized Discount																											6,100,000	6,100,000
Interest Expense, Debt																												4,300,000							0.0609			0.0726			0.0600			0.0621			0.0658
Amortization of Debt Discount (Premium)			2,467,000	3,055,000																200,000		800,000	700,000	1,700,000				100,000
Contractual interest expenses																				500,000		1,500,000	1,300,000	3,000,000
Effective Interest Rate																													10.00%
Intercompany Payment																											479,000,000
Adjustments to Additional Paid in Capital, Other																					30,300,000
Ownership Percentage																										100.00%
Letter of credit facility, amount														0	0															20,000,000.0	20,000,000	12,600,000
Line of Credit Facility, Amount Outstanding						0					0
Debt Instrument Frequency Of Periodic Payment															Quarterly
Stock Issued During Period, Shares, Conversion of Convertible Securities			747,085																		747,085
Make Whole Expense																																	14,300,000
Write off of Deferred Financing Cost																																		$ 600,000
Percentage of Debt Face Amount for Fee Calculation																														0.20%
Increased Note Redeem Rate																											2.00%	2.00%