Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 46,356us-gaap_NetIncomeLoss	$ 16,425us-gaap_NetIncomeLoss	$ 65,930us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of gain on sale of assets	(280)stra_AmortizationOfGainOnSaleOfAssets	(281)stra_AmortizationOfGainOnSaleOfAssets	(281)stra_AmortizationOfGainOnSaleOfAssets
Amortization of deferred rent	(1,092)stra_AmortizationOfDeferredRent	(462)stra_AmortizationOfDeferredRent	323stra_AmortizationOfDeferredRent
Amortization of deferred financing costs	780us-gaap_AmortizationOfFinancingCosts	780us-gaap_AmortizationOfFinancingCosts	795us-gaap_AmortizationOfFinancingCosts
Depreciation and amortization	20,630us-gaap_DepreciationAndAmortization	35,563us-gaap_DepreciationAndAmortization	23,973us-gaap_DepreciationAndAmortization
Deferred income taxes	(1,036)	(23,435)	(38)
Stock-based compensation	9,453us-gaap_ShareBasedCompensation	9,291us-gaap_ShareBasedCompensation	5,464us-gaap_ShareBasedCompensation
Changes in assets and liabilities:
Tuition receivable, net	685	4,024	1,744
Other current assets	(2,862)	2,434	(2,130)
Other assets	219	494	(135)
Accounts payable and accrued expenses	6,550	(116)	5,673
Income taxes payable and income taxes receivable	737	7,799	(4,306)
Deferred revenue	11,783	2,059	(14,870)
Other long-term liabilities	(14,373)	29,518	(80)
Net cash provided by operating activities	77,550	84,093	82,062
Cash flows from investing activities:
Purchases of property and equipment	(6,902)	(8,726)	(24,733)
Net cash used in investing activities	(6,902)	(8,726)	(24,733)
Cash flows from financing activities:
Payments on term loan	(3,125)us-gaap_RepaymentsOfLongTermDebt	(3,125)us-gaap_RepaymentsOfLongTermDebt	(20,000)us-gaap_RepaymentsOfLongTermDebt
Repurchase of common stock		(24,999)	(25,001)
Proceeds from term loan			47,500
Payments on revolving credit facility			(83,000)
Proceeds from revolving credit facility			63,000
Common dividends paid			(47,328)us-gaap_PaymentsOfDividendsCommonStock
Payment of deferred financing costs			(2,120)us-gaap_PaymentsOfFinancingCosts
Net cash used in financing activities	(3,125)	(28,124)	(66,949)
Net (decrease) increase in cash and cash equivalents	67,523	47,243	(9,620)
Cash and cash equivalents - beginning of year	94,760	47,517	57,137
Cash and cash equivalents - end of year	162,283	94,760	47,517
Non-cash transactions:
Purchases of property and equipment included in accounts payable	$ 412us-gaap_FairValueOfAssetsAcquired	$ 47us-gaap_FairValueOfAssetsAcquired	$ 529us-gaap_FairValueOfAssetsAcquired

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