Accordion feature allowing potential increase To credit facility.

Name:	get_AccordionFeatureAllowingPotentialIncreaseToCreditFacility
Namespace Prefix:	get
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Bank issued letters of credit.

+ Details

Name:	get_BankIssuedLettersOfCredit
Namespace Prefix:	get
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Credit facility refinance date.

+ Details

Name:	get_CreditFacilityRefinanceDate
Namespace Prefix:	get
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Additional.

+ Details

Name:	get_DebtAdditionalTextualAbstract
Namespace Prefix:	get
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Basis spread variable rate.

+ Details

Name:	get_DebtInstrumentBasisSpreadVariableRate
Namespace Prefix:	get
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Basis spread variable rate, Alternate.

+ Details

Name:	get_DebtInstrumentBasisSpreadVariableRateAlternate
Namespace Prefix:	get
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Description of variable rate banks base rate.

+ Details

Name:	get_DebtInstrumentDescriptionOfVariableRateBanksBaseRate
Namespace Prefix:	get
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument, Description of variable rate reference rate.

+ Details

Name:	get_DebtInstrumentDescriptionOfVariableRateReferenceRate
Namespace Prefix:	get
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt.

+ Details

Name:	get_DebtTextualAbstract
Namespace Prefix:	get
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility commitment fee percentage maximum.

+ Details

Name:	get_LineOfCreditFacilityCommitmentFeePercentageMaximum
Namespace Prefix:	get
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility commitment fee percentage minimum.

+ Details

Name:	get_LineOfCreditFacilityCommitmentFeePercentageMinimum
Namespace Prefix:	get
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ Details

Name:	us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Interest rate stated in the contractual debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 31

-Subparagraph b

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate
Namespace Prefix:	us-gaap
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateDescription
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

+ Details

Name:	us-gaap_WriteOffOfDeferredDebtIssuanceCost
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Debt (Details Textual) (USD $)	9 Months Ended
Debt (Details Textual) (USD $)	Sep. 30, 2011	Aug. 01, 2011	Dec. 31, 2010
Debt Additional (Textual) [Abstract]
Total Debt	$ 1,070,702,000		$ 1,159,215,000
Interest rate in addition to LIBOR	2.25%
Interest rate in addition to base rate	1.25%
Debt (Textual) [Abstract]
Accordion feature allowing potential increase to credit facility	475,000,000
Maturity date For Credit Facility	August 1, 2015
Accrued interest on line of credit facility	LIBOR plus 2.25% or the bank's base rate plus 1.25%, subject to adjustment
Credit facility reference rate	LIBOR
Credit facility alternate reference rate	bank's base rate
Fee to be paid by the company on the average unused portion of the $925 Million credit facility, Minimum	0.30%
Fee to be paid by the company on the average unused portion of the $925 Million credit facility, Maximum	0.40%
Write off of Deferred Debt Issuance Cost	1,681,000
Letters of Credit issued by Bank	8,000,000
Remaining Letters of Credit	317,000,000
$1.0 Billion Credit Facility [Member]
Debt Additional (Textual) [Abstract]
Total credit facility		1,000,000,000
Total Debt			700,000,000
Interest rate in addition to LIBOR	2.50%
Interest rate in addition to base rate	0.50%
Credit facility refinance date	Aug. 01, 2011
$925 Million Credit Facility [Member]
Debt Additional (Textual) [Abstract]
Total Debt	600,000,000	600,000,000	0
$525 Million Revolving Credit Facility [Member]
Debt Additional (Textual) [Abstract]
Total credit facility	525,000,000
Total Debt	200,000,000
Swingline Loans [Member]
Debt Additional (Textual) [Abstract]
Total credit facility	50,000,000
Letter of Credit [Member]
Debt Additional (Textual) [Abstract]
Total credit facility	75,000,000
$400 Million Term Credit Facility [Member]
Debt Additional (Textual) [Abstract]
Total credit facility	400,000,000
Convertible Notes Payable [Member]
Debt Additional (Textual) [Abstract]
Total Debt	315,940,000		306,551,000
Debt discount on Convertible Senior Notes	44,060,000		53,449,000
Interest	3.75%
Debt Instrument, Maturity Date	Oct. 01, 2014
Senior Notes, 6.75%, Due 2014 [Member]
Debt Additional (Textual) [Abstract]
Total Debt	$ 152,180,000		$ 152,180,000
Interest	6.75%
Debt Instrument, Maturity Date	Nov. 15, 2014