Debt And Other Long-Term Liabilities (Schedule Of Remaining Unamortized Debt Discount Expected To Be Recognized As Non-Cash Interest Expense) (Details) (USD $) In Thousands	9 Months Ended
Sep. 30, 2011
Debt And Other Long-Term Liabilities [Abstract]
Remainder of 2011	$ 1,694
2012	7,108
2013	7,712
2014	5,483
Total	$ 21,997

Unamortized Debt Discount to Be Recognized As Non Cash Interest Expense

Name:	cstr_UnamortizedDebtDiscountToBeRecognizedAsNonCashInterestExpense
Namespace Prefix:	cstr
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Unamortized Debt Discount to be Recognized as Non-Cash Interest Expense in Current Year

Name:	cstr_UnamortizedDebtDiscountToBeRecognizedAsNonCashInterestExpenseInCurrentYear
Namespace Prefix:	cstr
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Unamortized Debt Discount to be Recognized as Non-Cash Interest Expense in Year Four

Name:	cstr_UnamortizedDebtDiscountToBeRecognizedAsNonCashInterestExpenseInYearFour
Namespace Prefix:	cstr
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Unamortized Debt Discount to be Recognized as Non-Cash Interest Expense in Year Three

Name:	cstr_UnamortizedDebtDiscountToBeRecognizedAsNonCashInterestExpenseInYearThree
Namespace Prefix:	cstr
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Unamortized Debt Discount to be Recognized as Non-Cash Interest Expense in Year Two

Name:	cstr_UnamortizedDebtDiscountToBeRecognizedAsNonCashInterestExpenseInYearTwo
Namespace Prefix:	cstr
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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