Derivative Instruments and Hedging Activities (Details) - USD ($)		1 Months Ended		3 Months Ended
	Jul. 02, 2014	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014	Jun. 30, 2013	May. 15, 2013
Derivative [Line Items]
Proceeds from settlement of forward currency contracts				$ 2,313,000	$ 0
Designated as Hedging Instrument [Member] | Foreign currency forward [Member]
Derivative [Line Items]
Amount of loss recognized in Other Comprehensive Income on derivatives				0	346,000
Designated as Hedging Instrument [Member] | Foreign currency forward [Member] | Other expense [Member]
Derivative [Line Items]
Amount of loss on derivatives reclassified into income from Accumulated Other Comprehensive Income (effective portion)				352,000	245,000
Not Designated as Hedging Instrument [Member] | Foreign currency forward [Member] | Other income [Member]
Derivative [Line Items]
Amount of unrealized gain on derivatives				6,662,000	0
Other assets, net [Member] | Not Designated as Hedging Instrument [Member] | Convertible notes hedges [Member]
Derivative [Line Items]
Fair value, asset of derivative instruments		$ 45,163,000		45,163,000	0	$ 36,994,000
Long-term debt, less current maturities [Member] | Convertible notes embedded derivative [Member]
Derivative [Line Items]
Fair value, (liabilities) of derivative instruments			$ (46,500,000)
Long-term debt, less current maturities [Member] | Not Designated as Hedging Instrument [Member] | Convertible notes embedded derivative [Member]
Derivative [Line Items]
Fair value, (liabilities) of derivative instruments		(45,163,000)		(45,163,000)	0	(36,994,000)
Receivables, prepaid expenses and other current assets [Member] | Designated as Hedging Instrument [Member] | Foreign currency forward [Member]
Derivative [Line Items]
Fair value, asset of derivative instruments		2,173,000		2,173,000	1,952,000	2,420,000
Receivables, prepaid expenses and other current assets [Member] | Not Designated as Hedging Instrument [Member] | Foreign currency forward [Member]
Derivative [Line Items]
Fair value, asset of derivative instruments		7,814,000		$ 7,814,000	$ 0	$ 1,152,000
9% unsecured notes due 2015 [Member] | Grupo Finmart [Member]
Derivative [Line Items]
Cross-border debt offering							$ 30,000,000	$ 30,000,000.0
Repayments of long-term debt		$ 17,500,000
2.125% cash convertible senior notes due 2019 [Member]
Derivative [Line Items]
Convertible senior notes issued and settled	$ 30,000,000.0		200,000,000.0
Option to purchase additional principal			$ 30,000,000.0