Long-Term Debt (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended				9 Months Ended		12 Months Ended		0 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended				0 Months Ended	3 Months Ended		9 Months Ended		0 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended			0 Months Ended	9 Months Ended		12 Months Ended	0 Months Ended		0 Months Ended					9 Months Ended		12 Months Ended	0 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 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]	Sep. 30, 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]	Sep. 30, 2014 Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member] PCN	Sep. 30, 2013 Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member] PCN	Dec. 31, 2013 Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member] PCN	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]	Sep. 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]	Sep. 30, 2014 Variable Rate Senior Unsecured Note Due 2018 [Member]	Sep. 30, 2014 Variable Rate Senior Unsecured Note Due 2018 [Member]	Dec. 31, 2013 Variable Rate Senior Unsecured Note Due 2018 [Member]	Sep. 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]	Mar. 31, 2014 5.25% Convertible Senior Notes Due 2029 [Member]	Sep. 30, 2013 5.25% Convertible Senior Notes Due 2029 [Member]	Sep. 30, 2014 5.25% Convertible Senior Notes Due 2029 [Member]	Sep. 30, 2013 5.25% Convertible Senior Notes Due 2029 [Member]	May 15, 2013 5.75% $300 Million Senior Unsecured Notes	Sep. 30, 2014 5.75% $300 Million Senior Unsecured Notes	Sep. 30, 2014 5.75% $300 Million Senior Unsecured Notes	Jun. 30, 2014 9.75% $500 Million Senior Unsecured Notes Due 2021 [Member]	Sep. 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]	Sep. 30, 2014 Enova Standby And Letter Of Credit [Member]	Sep. 30, 2014 Standby Letters Of Credit [Member]	Sep. 30, 2014 Waiver And Amendment [Member]	Sep. 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]	Sep. 30, 2013 6.09% Series A Senior Unsecured Notes Due 2016 [Member]	Sep. 30, 2014 7.26% Senior Unsecured Notes Due 2017 [Member]	Dec. 31, 2013 7.26% Senior Unsecured Notes Due 2017 [Member]	Sep. 30, 2013 7.26% Senior Unsecured Notes Due 2017 [Member]	Sep. 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]	Sep. 30, 2013 6.00% Series A Senior Unsecured Notes Due 2019 [Member]	Sep. 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]	Sep. 30, 2013 6.21%Series B Senior Unsecured Notes Due 2021 [Member]	Sep. 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]	Sep. 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]	Sep. 30, 2014 Minimum Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member]	Sep. 30, 2013 Minimum Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member]	Dec. 31, 2013 Minimum Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member]	May 15, 2014 Minimum Enova Line Of Credit [Member]	Sep. 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]	Sep. 30, 2014 Maximum Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member]	Sep. 30, 2013 Maximum Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member]	Dec. 31, 2013 Maximum Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member]	May 15, 2014 Maximum Enova Line Of Credit [Member]	Sep. 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
Debt instrument basis spread on variable rate																																		0.25%																								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						2.97%	3.30%	2.81%
Debt instrument, maturity year																			2018																		2016			2017			2019			2021			2022
Debt instrument, maturity date																												May 15, 2018
Debt instrument maturity days																																																					3 days	1 day	3 days								7 days	31 days	31 days
Number Of Pricing Tranches										2	3	3
Debt Issuance Costs															1,600,000															8,800,000		14,700,000
Debt Instrument, Issuance Date														May 14, 2014														May 15, 2013
Debt instrument, interest rate																										5.25%		5.75%				9.75%	9.75%				6.09%			7.26%			6.00%			6.21%			6.58%
Percentage of Notes Principal Redeemable																																35.00%
Note Redeem Rate																												100.00%				103.00%																									100.00%										109.75%
Note Repurchase Rate																												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
Debt Instrument, Repurchased Face Amount																								58,600,000					103,500,000	103,500,000
Repayments of Long-term Debt																							44,400,000	89,500,000					107,200,000							106,200,000
Gains (Losses) on Extinguishment of Debt	5,991,000	346,000	22,553,000	346,000														100,000						(1,500,000)					(6,000,000)							(600,000)
Long-term Debt	700,043,000	682,849,000	700,043,000	682,849,000	739,989,000													0	0	33,333,000	35,417,000																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																																6,000,000
Interest Expense, Debt																																16,500,000
Amortization of Debt Discount (Premium)			3,845,000	4,665,000																					800,000	700,000	2,500,000					200,000
Contractual interest expenses																									1,500,000	1,300,000	4,500,000
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																																		20,000,000	20,000,000
Line of Credit Facility, Amount Outstanding																																		3,000,000	12,600,000
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
Percentage of Debt Face Amount for Fee Calculation																																		0.20%
Increased Note Redeem Rate																																2.00%